The accuracy of snipper shot is highly depends on "accuracy" parameter of the selected soilder.
Guard turret won't notice you after the camera is destroyed. Camera hangs above turret indoor level.
Recoil and accuracy change when you sit and prone.
Suite power can be restored with help of rechargers. Rechargers can be found on the second floor of the base on open-space level and in the 8-like corridor on the indoor level.
Missiles can be guided - just mark the target with "Use" key default - "Enter".
Shooting short threads with submachine gun gives better accuracy.
You can see what your team member see in multiplayer game. Enable HUD camera with "HUD mode" key default - "/". Cycle througth your team members with "Map size/Cycle camera" keys default - "][","]".
Green syringe add 10 to health.
Always search the dead bodies with "Use" key Default - "Enter". Armament and syringes can be found there.
You can come to sniper on the tower very close, if you use bushes and trees as a cover. Just keep a tree on the sight line as you move.
Monsters can hear the machine gun in much longer distance than sniper gun.
Bring up the console by pressing "". Then type "xenux". This will add a syringe to each corpse for a health boost of 10. Each corpse can have up to 2-3 syringes, but you can repeat he cheat as you remove them.
Just open the file PICSTEAMTEAM.INI in your GameDir with a Text editor. There you can change all quality of your team-members. Rank, Experience, Speed, Reaction...