In the early days of militarized operations on Mallera-9 units were unmasked and easily identifiable.
The adoption of masks into combat operations were due to a number of reasons that were all operational in nature. Masks were introduced before the introduction of ORC.
1: Inter-unit interactions & relationships: Units began to develop friendships and formed bonds between each other which in sectors that experienced a high number of expenditure seen variations in unit performance.
2: Command unit humanization of combat units: Command units would often feel for a unit seeing emotional expression on units faces & would hesitate to give orders that result in expenditure. This affected combat ability and effectiveness against enemy assets over time.
3: Identification of combat units post service: this was the major contributing factor to implementing the now standard half mask. If a unit was to complete her contract period & then return to normal life her face is forever on enemy data bases. In instances units were captured in the "real world" & taken away, interrogated and forced information.