1) You can set up your Helicarrier defenses in between Wars (also known as Peacetime).

2) Access your Alliance Helicarrier from the Alliance War screen.

3) Select an available room.

4) Claim a slot. (You can only defend a single room.)

5) Edit your defensive squads.
a) You can set a total of 8 squads.
b) Unfilled squad slots will use default S.H.I.E.L.D. Guards, which are Level 40, Gear Tier 4, with
Ability Levels 3/3/1.
c) Squads can be a mix of characters from your roster and default S.H.I.E.L.D. Guards.
d) Characters set on defense CANNOT be used to attack.
e) The order in which squads are placed is the order in which they will appear to attackers.

TIP: Managing your roster is key to being successful in Alliance War. Think ahead to which
characters you'd like to use for defense and which ones to use to attack.

6) Once you have set up your defenses, you are ready for War.
NOTE: Rooms that are above, below, to the left, and to the right of a room are considered adjacent to that room.