SoffeMen's 3 Pack - USA Poly/Cotton Military Tee

Is this shirt ar 670-1 compliant with ocps?

do these run big or small? I am usually in-between a medium and large? Thanks in advance.

How long are the medium? how long are the large? will they stay tucked in over my belly? (i'm 6'1", 230 lb, size 34 pants--vanity sizing, i'm sure…)

I am a female in the military. I am 5’8” and 135 pounds. What size would you recommend?