Dev Cheats
At the console enter 'sv_cheats 1'then enter the following codes
No damage:
'god'

Never Die:
'buddha'
Walk through walls:
'noclip'
Wire frame models:
'mat_wireframe1'

Only objects effected by physics are wireframe:
'vcollide_wireframe 1'

Infinite power for your suit:
'infinite_aux_power'

Kill all npc’s in the area:
'npc_kill'

Enemies don’t attack:
'notarget'

Spawn a scout car:
'ch_createjeep'

Spawn an airboat:
'ch_createairboat'

Spawn an airboat:
'impulse 83'

Spawn a Jeep
'Impulse 82'

All weapons and ammo:
'impulse 101'
skulls:
'impulse 102'
Removes weapon model from the screen:
'impulse 200'
Draw game triggers:
'showtriggers_toggle'

Draw normal maps:
'mat_normalmaps 1'

Draw surface materials:
'mat_normals 1'

Turn off bump mapping:
'mat_fastnobump 0'