CAMP BULLIS, Texas " Staff Sgt. Jason Proefrock, Intelligence and Sustainment Company, Headquarters and Headquarters Battalion, U.S. Army North (Fifth Army), knocks-out another sit-up as he attempts to max the Army Physical Fitness Test May 13. Staff Sgt. Jason Ruiz holds his ankles as Staff Sgt. Charles Ridgeway grades the event. Ruiz is from Headquarters Support Company, HHBn, Army North, and Ridgeway is from Operations Company, HHBn. Proefrock, originally from Buffalo, N.Y., is taking the APFT as part of the Joint Base San Antonio 2013 Noncommissioned Officer and Soldier of the Year "Best Warrior" Competition. Thirty-six Soldiers from U. S. Army North, U.S. Army South, U.S. Army Medical Department Center and School, U.S. Army Southern Regional Medical Command and U.S. Army Installation Management Command are competing in the week-long competition that culminates May 17 with a barbecue Friday at the historic Quadrangle.