Xstat is a biocompatible filler, especially used in Gunshot Wounds (GSW).
CCHF is short for Crimean-Congo Hemorrhagic Fever.
CACO is a Casualty Assistance Calls Officer. This is the person who breaks the news that a loved one has died, and assists the next of kin through the process of finalizing the deceased military member's affairs.
P.O.G. stands for Person Other Than Grunt.
RPG is short for Rocket Propelled Grenade.