1. Cric kit
But seriously, in airsoft, you're looking at dehydration, temperature-related maladies and minor cuts that you should attempt to deal with and not get straight to the hospital.
do a First-Aid course, and remember that if you're unsure then it's best to stop playing and do as above (hospital) you only get one life.
"History teaches that all conquerors who have allowed their subject races to carry arms have prepared their own downfall by doing so."
-- Adolph Hitler, April 11 1942.
Adolph hitler supports gun control.. Do you?
Sic Semper Tyrannis.