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---
title: Unit_FAQ
---
::: mw-parser-output
::: {#toc .toc aria-labelledby="mw-toc-heading" role="navigation"}
::: {.toctitle dir="ltr" lang="en"}
## Contents {#mw-toc-heading}

[ ]{.toctogglespan}
:::

-   [[ 1 ]{.tocnumber} [ Units ]{.toctext}](#Units)
    -   [[ 1.1 ]{.tocnumber} [ General Unit Questions
        ]{.toctext}](#General_Unit_Questions)
        -   [[ 1.1.1 ]{.tocnumber} [ My aircraft/ships never get
            repaired! What can I do?
            ]{.toctext}](#My_aircraft.2Fships_never_get_repaired.21_What_can_I_do.3F)
        -   [[ 1.1.2 ]{.tocnumber} [ How to target a specific province
            with air units?
            ]{.toctext}](#How_to_target_a_specific_province_with_air_units.3F)
        -   [[ 1.1.3 ]{.tocnumber} [ How to move garrison to another
            island?
            ]{.toctext}](#How_to_move_garrison_to_another_island.3F)
        -   [[ 1.1.4 ]{.tocnumber} [ Why I can not rebase my aircraft
            and naval units to my ally\'s province?
            ]{.toctext}](#Why_I_can_not_rebase_my_aircraft_and_naval_units_to_my_ally.27s_province.3F)
        -   [[ 1.1.5 ]{.tocnumber} [ How do I strategically redeploy
            units?
            ]{.toctext}](#How_do_I_strategically_redeploy_units.3F)
        -   [[ 1.1.6 ]{.tocnumber} [ How to perform airborne assault?
            ]{.toctext}](#How_to_perform_airborne_assault.3F)
        -   [[ 1.1.7 ]{.tocnumber} [ I\'m unable to rebase planes onto
            my carriers! What\'s wrong?
            ]{.toctext}](#I.27m_unable_to_rebase_planes_onto_my_carriers.21_What.27s_wrong.3F)
        -   [[ 1.1.8 ]{.tocnumber} [ Why doesn\'t my HQ double the
            command limit for my leaders?
            ]{.toctext}](#Why_doesn.27t_my_HQ_double_the_command_limit_for_my_leaders.3F)
        -   [[ 1.1.9 ]{.tocnumber} [ How to select more than one air
            groups?
            ]{.toctext}](#How_to_select_more_than_one_air_groups.3F)
        -   [[ 1.1.10 ]{.tocnumber} [ Why can\'t I merge certain air
            groups together?
            ]{.toctext}](#Why_can.27t_I_merge_certain_air_groups_together.3F)
        -   [[ 1.1.11 ]{.tocnumber} [ What is the purpose of higher
            ranked air leaders when there is a limitation of 4 air units
            to a formation?
            ]{.toctext}](#What_is_the_purpose_of_higher_ranked_air_leaders_when_there_is_a_limitation_of_4_air_units_to_a_formation.3F)
        -   [[ 1.1.12 ]{.tocnumber} [ Is it better to create homogenous
            or mixed stacks?
            ]{.toctext}](#Is_it_better_to_create_homogenous_or_mixed_stacks.3F)
        -   [[ 1.1.13 ]{.tocnumber} [ Why can\'t my troops dig in?
            ]{.toctext}](#Why_can.27t_my_troops_dig_in.3F)
    -   [[ 1.2 ]{.tocnumber} [ Upgrades ]{.toctext}](#Upgrades)
        -   [[ 1.2.1 ]{.tocnumber} [ Can I upgrade ships?
            ]{.toctext}](#Can_I_upgrade_ships.3F)
        -   [[ 1.2.2 ]{.tocnumber} [ Why is my light armor upgraded to
            medium armor?
            ]{.toctext}](#Why_is_my_light_armor_upgraded_to_medium_armor.3F)
    -   [[ 1.3 ]{.tocnumber} [ Reinforcements
        ]{.toctext}](#Reinforcements)
        -   [[ 1.3.1 ]{.tocnumber} [ Why do I suffer so much
            Manpower-Drain during the winter?
            ]{.toctext}](#Why_do_I_suffer_so_much_Manpower-Drain_during_the_winter.3F)
:::

# [ [Units]{.mw-selflink .selflink} ]{#Units .mw-headline}

### [ General Unit Questions ]{#General_Unit_Questions .mw-headline}

#### [ ]{#My_aircraft/ships_never_get_repaired!_What_can_I_do?} [ My aircraft/ships never get repaired! What can I do? ]{#My_aircraft.2Fships_never_get_repaired.21_What_can_I_do.3F .mw-headline}

You may prioritize units for upgrade/repair by clicking the
\"Prioritize\" checkbox in the bottom left-hand corner of the unit\'s
information window. Units with this option checked will be repaired and
upgraded before units without this option checked. It is important to
note that ships cannot be upgraded. Also bear in mind that if you
prioritize most of your units, you\'ll still have to wait for the CPU to
work through that repair/upgrade queue. Only prioritize the ones you
need most. Of course you will need to allocate some IC to your
\"reinforcements\" slider to repair all unit types, even ships.

#### [ ]{#How_to_target_a_specific_province_with_air_units?} [ How to target a specific province with air units? ]{#How_to_target_a_specific_province_with_air_units.3F .mw-headline}

It is not possible. You can only target an area. However, ground attack
and interdiction missions will tend to target provinces where combat is
occurring. This can be further encouraged by setting the air units\'
mission to begin an hour after land combat starts.

#### [ ]{#How_to_move_garrison_to_another_island?} [ How to move garrison to another island? ]{#How_to_move_garrison_to_another_island.3F .mw-headline}

Move transports (with enough capacity) to the province\'s port, select
the garrison and press the load button. Send the transport to the island
you wish to deploy the garrison unit.

#### [ ]{#Why_I_can_not_rebase_my_aircraft_and_naval_units_to_my_ally's_province?} [ Why I can not rebase my aircraft and naval units to my ally\'s province? ]{#Why_I_can_not_rebase_my_aircraft_and_naval_units_to_my_ally.27s_province.3F .mw-headline}

To rebase them, you need to make sure that the province has naval or air
base. Moreover, it is not possible to do that during peace time. You
must be at war to use an ally\'s bases.

#### [ ]{#How_do_I_strategically_redeploy_units?} [ How do I strategically redeploy units? ]{#How_do_I_strategically_redeploy_units.3F .mw-headline}

The following requirements must be satisfied for [Strategic
Redeployment](/wiki/Strategic_Redeployment "Strategic Redeployment")
(SR):

-   Rear Area Supply Dumps (an Infantry tech) is researched.
-   There is a land connection between the current location of division
    and the target.

Select the unit(s). Hold ctrl + right click in the destination province.
For garrisons, a simple right click will do.

-   NOTE: you can not SR thru an ally\'s territory unless you are at
    war.

#### [ ]{#How_to_perform_airborne_assault?} [ How to perform airborne assault? ]{#How_to_perform_airborne_assault.3F .mw-headline}

Airborne assault is a mission that must be completed using paratrooper
division and transport plane. Each transport plane can carry one
airborne division. To be able to perform the mission, the following
conditions must be satisfied:

-   Battlefield Interdiction Doctrine (air doctrine tech) has been
    researched.
-   Target province is within the transport\'s range.
-   The transport plane has to be at full organization. To make sure
    that the air transport is at full organization, click on the air
    transport formation and pause over the organization bar; if it\'s
    says daily regain is greater than zero, then the air transport is
    not yet back to full organization.
-   The paratrooper and transport must be in the same province. Load the
    paratrooper just before the mission begins. Use offensive supply for
    the para if you can afford it.
-   [Weather](/wiki/Weather "Weather") must not be stormy (stormy
    weather grounds all air operations).
-   Also note that flying divisions around with air transports is not
    allowed in the game. Historically divisions in WW2 moved around by
    land or sea. Gliders also were a component of every air transport
    fleet. Smaller units that are not represented in the game were
    sometimes flown in as reinforcements, but entire divisions were not
    air transported in WW2.
-   Air supply can be done in small quantities by air transports after
    you have researched the 2nd 1940 air transport model.
-   See also this [Paratrooper
    FAQ](http://forum.paradoxplaza.com/forum/showthread.php?t=245902){.external
    .text rel="nofollow"}

#### [ ]{#I'm_unable_to_rebase_planes_onto_my_carriers!_What's_wrong?} [ I\'m unable to rebase planes onto my carriers! What\'s wrong? ]{#I.27m_unable_to_rebase_planes_onto_my_carriers.21_What.27s_wrong.3F .mw-headline}

Unlike in original HoI, in Hearts of Iron 2 you cannot place aircraft
squadrons on carrier vessels (CV). There is special brigade attachment
called \"Carrier Air Group\" (CAG) that represents planes carried by
carrier ships. You must build and deploy CAG\'s (like other brigades) to
take full advantage of carriers. Note that only in Doomsday, there is a
new light carrier unit which is built with it\'s own small air component
and to which a CAG can not be attached.

#### [ ]{#Why_doesn't_my_HQ_double_the_command_limit_for_my_leaders?} [ Why doesn\'t my HQ double the command limit for my leaders? ]{#Why_doesn.27t_my_HQ_double_the_command_limit_for_my_leaders.3F .mw-headline}

HQ must be commanded by a General or Field Marshall in an adjacent
province to have any effect. HQ allow you to have more div attacking,
but they do not allow you to exceed the rank formation capacities of 1,
3, 9, and 12 div. For more information on HQ range, please refer to this
[guide](/wiki/HQ_Units_in_Action "HQ Units in Action") . For a
comprehensive review of land combat and HQ, review [Land Combat
Efficiency
FAQ](/wiki/Land_Combat_Efficiency_FAQ "Land Combat Efficiency FAQ"){.mw-redirect}
.

#### [ ]{#How_to_select_more_than_one_air_groups?} [ How to select more than one air groups? ]{#How_to_select_more_than_one_air_groups.3F .mw-headline}

Select one air group and hold the shift key while drawing a box (hold
left mouse button and drag it) around the air base icon.

#### [ ]{#Why_can't_I_merge_certain_air_groups_together?} [ Why can\'t I merge certain air groups together? ]{#Why_can.27t_I_merge_certain_air_groups_together.3F .mw-headline}

In 1.2 there is a limit of 4 divisions in an air group. This parameter
can be changed in the \\db\\ misc.txt file.

NOTE: Currently, in 1.3a, the above limitation applies only to the human
player and not the AI. If you undo \"fog of war\" you will see stacks
ranging from five to ten, sometimes higher. To test this, try saving the
game and reloading as another nation. If the nation you\'ve selected has
a large air force, then in the game log you will immediately see a list
of squadrons being \"reassigned\" as this rule is implemented due to you
taking control. It remains unclear whether this is a bug or a design
decision.

#### [ ]{#What_is_the_purpose_of_higher_ranked_air_leaders_when_there_is_a_limitation_of_4_air_units_to_a_formation?} [ What is the purpose of higher ranked air leaders when there is a limitation of 4 air units to a formation? ]{#What_is_the_purpose_of_higher_ranked_air_leaders_when_there_is_a_limitation_of_4_air_units_to_a_formation.3F .mw-headline}

If more than 4 air units engage in one combat, you get an over command
max penalty of -25 for each unit above the leader\'s rank command
capacity. Two air groups of four fighting in the same air space would
need either an Air General or an Air Marshall leading one of the two
groups. With Lt Gen in charge of each group, four of the eight air units
would get this penalty.

#### [ ]{#Is_it_better_to_create_homogenous_or_mixed_stacks?} [ Is it better to create homogenous or mixed stacks? ]{#Is_it_better_to_create_homogenous_or_mixed_stacks.3F .mw-headline}

This question can be applied to stacks of troops or their brigades, and
it has everything to do with speed. Homogenous troop stacks should
always be better, so they maintain the speed of the movement. Once you
have a homogenous troop stack, it helps to have specialized roles
sometimes, especially when it comes to engineering squads (which raise
the speed of movement again), and allow the entire stack to storm across
rivers, or artillery (which lowers speed of all by 1, but adds great
attack bonuses). When it comes to defence, you can mix AA, and AT and
even police. \"Just remember the movement speed\" is the best answer
here.

#### [ ]{#Why_can't_my_troops_dig_in?} [ Why can\'t my troops dig in? ]{#Why_can.27t_my_troops_dig_in.3F .mw-headline}

You need the 1936 basic construction engineering tech. Your troops can
not dig in while you are at peace. They automatically start digging in
when you are at war. If they move or attack or support attack, they lose
their dug in status and then have to start digging in again.

### [ Upgrades ]{#Upgrades .mw-headline}

#### [ ]{#Can_I_upgrade_ships?} [ Can I upgrade ships? ]{#Can_I_upgrade_ships.3F .mw-headline}

No, you can not. You may only upgrade land and air units as well as
brigade attachments. Carrier Air Groups (CAG) attached to carriers (or
in your TC pool) can be upgraded. The Armageddon expansion introduced
naval brigades which can enhance the stats of the ships they\'re
attached to. Those - like all other brigades - can be upgraded normally.

#### [ ]{#Why_is_my_light_armor_upgraded_to_medium_armor?} [ Why is my light armor upgraded to medium armor? ]{#Why_is_my_light_armor_upgraded_to_medium_armor.3F .mw-headline}

After you researched basic medium armor, they will be upgraded
automatically since medium armor has superior statistics compared to
light armor. Even speed for medium armor divisions is better than light
armor.

### [ Reinforcements ]{#Reinforcements .mw-headline}

#### [ ]{#Why_do_I_suffer_so_much_Manpower-Drain_during_the_winter?} [ Why do I suffer so much Manpower-Drain during the winter? ]{#Why_do_I_suffer_so_much_Manpower-Drain_during_the_winter.3F .mw-headline}

This is a bug, which was fixed in patch 1.2.

If you ever attacked the Soviet Union during the winter, you will notice
this. The MP drains very fast. According to [this
thread](http://forum.paradoxplaza.com/forum/showthread.php?t=181561){.external
.text rel="nofollow"} , it is a bug that can by circumvented by stopping
reinforcements during winter. The attrition damage will be much lower
and the troops can survive the winter.
:::