Welcome to ETS!
I'd suggest that you carry a PSK (personal survival kit) on your person. Mine is a Doug Ritter PSP+ with a mini-Bic (secured with a cable tie) and a 2-person Heatsheets. Your knife and pistol (if you're carrying one) should also be on-body.
Preferably in a location that's not going to REALLY hurt if you roll. Ie, on a hip or in a crotch pocket.
The military puts us through a "roll-over" trainer for the Hum-vees and other things. Really fun when the M4 whacks you in the face.