Quoc: A physical training uniform is a military uniform used during exercise, calisthenics, drills, and in some cases, very casual periods of time (off-duty time during Initial Entry Training in the U.S. Army, for example). The United States Army, Marine Corps, Navy, Air Force, and Coast Guard require use of a physical training (PT) uniform during unit exercise (including formation runs, calisthenics, and conditioning exercises). Some military units produce unique T-shirts with their unit insignia and motto, and for special events, this shirt is part of the uniform. Occasionally, exercise will be conducted in that branch's utility uniforms, normally with the blouse removed and the undershirt exposed (also known as "boots and utes").

Answer this question based on the passage: what does pt stand for in the army?
HW Chung: OK, some thoughts:
This is the relevant information: The United States Army, Marine Corps, Navy, Air Force, and Coast Guard require use of a physical training (PT) uniform during unit exercise (including formation runs, calisthenics, and conditioning exercises). The answer is physical training.