Not Legal Advice: As per forums, you can wear a knee brace as long as the doctor writes it on your profile to wear it.
What we found is a guideline for Army Physical Fitness Test (APFT):
A-5. Any piece of clothing not prescribed as a component of the IPFU, ACU or commander authorized civilian attire is not permitted for wear during the APFT. Neither are devices or equipment that offer any potential for unfair advantage during testing. Unless prescribed as part of the Soldier’s medical profile, the wearing of the following items are not authorized: nasal strips, weight lifting gloves, backbraces, elastic bandages, or braces. Electronic devices are also not authorized (MP3 players, radios, cellphones, and compact disc players). AR 670-1, Wear and Appearance of Army Uniforms and Insignia, specifies the components of the IPFU ensemble.
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Before you go to boot camp, be sure you have taken care of the every-day issues in your life. Check out these 8 tips for successfully completing basic training shared by Military.com.