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We rolled them back in my day of 1998 too when I went through basic training, but they roll them now, which in my opinio, in is way easier than folding them into that little square.
And it keeps them wrinkle free. ;)
Certainly, sand just means the color of the shirt. In the AF we call it the "sand tee" to differentiate it from the PT shirt and white tee shirt also issued during BMT.
Gelish Gel Manicure at Home
How to roll t-shirts in AF BMTView Instructable »