I would point to the emotional climax of the short story as evidence of the sense of missing identity that is a part of the sniper. Prior to this point, the sniper was presented as being whole. He is fully engaged in the mission. He commits himself with intensity towards doing what he must do. He denies himself self- gratification and endures pain in the understanding that his mission comes before anything else. It is here in which the sniper is shown as whole, complete in his consciousness. When the target is hit, the sniper has accomplished his mission and his wholeness of identity is what makes him eager to look at his accomplishment.
It is at this point where the text pivots to show a sense of the missing identity intrinsic to the sniper. He does not know it until this point, but upon realizing it, the reality is a brutal one:
The sniper looked at his enemy falling and he shuddered. The lust of battle died in him. He became bitten by remorse. The sweat stood out in beads on his forehead. Weakened by his wound and the long summer day of fasting and watching on the roof, he revolted from the sight of the shattered mass of his dead enemy. His teeth chattered, he began to gibber to himself, cursing the war, cursing himself, cursing everybody.