Tip of the spear
Tech. Sgt. Chloe N. Hayes, 1st Special Operations Aerospace Medicine Squadron Bioenvironmental Engineering Craftsman, is checking the heat stress machine, which helps determine the flag conditions for the base, at Hurlburt Field, Fla., 24 August 2010. (DoD photo by Air Force Airman Caitlin O'Neil-McKeown)