In Strife, the only time the Front's Soldiers attack you is if you make any sort of negative noise (like firing the assault gun) in Map 02 and 03. The soldiers in all the other maps (Map 07 and Map 10) are always friendly to each other and you in addition to attacking the enemy.
In Vavoom, the Front's Soldiers will always attack you if attacked. What is even worse is that they attack each other.. which should never happen.