Senior Airman Jefonda Cross, a 19th Medical Support Squadron chemistry section supervisor, drops blood on a petri dish Oct. 30, 2012, at Little Rock Air Force Base, Ark. The 19th MDSS laboratory performs on average more than 700 different tests a week. (U.S. Air Force photo by Airman 1st Class Rusty Frank)
Airman 1st Class Rusty Frank
Taken on 30 October 2012
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