The Army helmet and dirty Army helmet provide a ballistic protection rating of 10 like the combat helmet, but offer no energy protection and cannot be upgraded.
Army fatigues provide a Strength bonus of 1 as well as an Agility bonus of 1. They do not take any armor slots, thus can be worn in addition to a full set of armor.
By progressing through the DIA cache quests for the Railroad, given by P.A.M., Tinker Tom will unlock the ability to upgrade the defense of this piece of clothing using ballistic weave. The amount of upgrades available depends on the attained rank for the Armorer perk, where a defense rating of 110 is attainable in both ballistic and energy categories.
Two clean helmets can be found inside USAF Satellite Station Olivia. One is in the room behind the novice-locked door, next to a skeleton in the very back, where the intel room key is also found. The other can be found on a teddy bear in the room to the right of Ack-Ack.
A clean helmet can be found on a concrete block near a dead soldier outside an APC between Sanctuary Hills and the ranger cabin. The APC is near a small body of water and has several radioactive barrels outside.
PC After applying any level of ballistic weave, the DMG Resist box reports the damage and energy resistances correctly, however at the bottom where it adds up all the resistances, the energy is 15 less than reported.[verified]