Advice and instructions taken from actual military sources.

'When the pin is pulled, Mr. Grenade is not our friend.' --U.S. Marine Corps
'Aim towards the enemy.' --Instruction printed on U.S. Rocket Launcher
'If the enemy is in range, so are you.' --Infantry Journal
'A slipping gear could let your m203 grenade launcher fire when you least expect it. That would make you quite unpopular in what's left of your unit.' --Army's magazine of prevention maintenance
'It is generally inadvisable to eject directly over the area you just bombed.' --U.S. Air Force manual
'Try to look unimportant; the enemy may be low on ammo.' --Infantry Journal
'Cluster bombing from B-52s is very, very accurate. The bombs are guaranteed to always hit the ground.' --USAF Ammo Troop
'Tracers work both ways.' --U.S. Army Ordnance
'Five-second fuses only last three seconds.' --Infantry Journal
'If your attack is going too well, you're walking into an ambush.' --Infantry Journal
'No combat-ready unit has ever passed inspection.' --Unknown
'Any ship can be a minesweeper....once.' --Anon
'If you see a bomb technician running, try to keep up with him.' --USAF Ammo Troop
'Never tell the platoon sergeant you have nothing to do.' --Unknown Marine Recruit
'Don't draw fire; it irritates the people around you.' --Infantry Journal
'Bravery is being the only one who knows you're afraid.' --David Hackworth