Hightailing it across the vast, open countryside in the middle of the night. Fighting a desperate rearguard action against an indomitable force. Squinting through the claustrophobic green murk of nightvision for enemies hidden among trees and rocky outcrops.
Fearing the lethality of their bullets and the scarcity of your own. Faced with constant dilemmas to engage or retreat, to scour for ammo or make do with dwindling supplies, to turn back and heal a fallen comrade or push on and safeguard the rest of your squad.