The crewneck is a nice touch for a shirt that looks good untucked or tucked.
USAF T-Shirt United States Air Force Logo PT Physical Training Military BUF02
A nice touch is the black piping along the collar.
Delta United States of America Washington DC T Shirt Mens Large Gray Logo Cotton
You will find that a solid T-shirt like this one is a wardrobe workhorse.
USAF T-Shirt United States US Air Force T shirt Physical Training Tee S-3XL
A nice touch is the deep hem that keeps the shirt tucked in through all seasons.
“United States Army Ft Bliss, TX 1775” Double Sided Green T Shirt – Sz XL – NWT
A classic crewneck makes this t-shirt a no-brainer for daily use.