Student at the USAF Low Level Airlift Tactics School. The "white object" in my pocket was a much needed "Airsickness" bag preflighted and ready for use!! 200 feet at 350 knots indicated airspeed in the desert and mountains of Arizona! I was one of the lookout's strapped in one of the paratroop doors in the cargo compartment!! While being chased by USAF fighters, it was the newest version of the "Vomit Comet!!"