Half-Life: Counter-Strike Cheats

Use one of the following values with the "skin [skin name]" code to change to the corresponding skin. Note: Place the skin name in quotes if they are not activated without them.
 
Skin Name
SAS sas
GSG9 gsg9
SEAL seal
Terrorist terror
Arab arab
Guerrilla guerrilla
Arctic arctic
VIP vip
Hostage hostage

Two people are required for this trick. Go to the top
ledge inside then go to the corner nearest the exit (not the boxes
one, but the corner directly to the side) Have someone else crouch
down then have your character stand on top of their head. Jump
and you will go outside. If this does not work, then have both
players jump at the same time.
Strategy: Console commands: by by Kevin Lee

Type bind "setinfo model sas" (for terrorist only). Your whole body will change into UK SAS suit. Keep pressing the key that was bound to that command.