You see those crates at the start of the Mission where there is the sniper rifle?Go to that spot and press C down button to crouch (or you don’t have to) grab/touch the sniper rifle to pick it up then press R to enter first person mode, and aim for the tan soldier and fire (z) then move the joystick to target at the other tan soldier whos walking but aim and then fire in his Direction. Then run between the rocks to aviod the tan tank.

/