Guns, knives, flashlights, shark repellant, PRC-112, iodine tablets,... whatever. Typical Navy/Marine loadout-of-pain.
In the USAF, we carry a pencil, spork (spoon/fork thingy) in the slot next to the pencil (in lieu of the pen), and a cell phone. Done.
If I bailout (sorry,... "eject"), I call...