The HAWC's Metabolic Cart
U.S. Air Force Lt. Col John McArthur, 355th Medical Support Squadron Radiology Flight chief, tests out the metabolic cart while David Friederich, Health and Wellness Center health and fitness specialist, monitors his activity at the HAWC on Davis-Monthan Air Force Base, Ariz., Sept. 11, 2012. The test takes approximately 8-12 minutes to complete. (U.S. Air Force photo by Airman 1st Class Christine Griffiths/Released)