US Air Force (USAF) STAFF Sergeant (SSGT) John Sorenson takes a breath while swimming a 300-meter long qualification swim to join the 6th Security Forces Squadron (SFS) Boat Patrol at MacDill Air Force Base (AFB). The 6th SFS Boat Patrol qualification is a gauntlet of push-ups; sit-ups, 2 mile run, chin-ups, dips, a 15 yard underwater swim and a 300 meter swim to finish the day's qualifications