Bring 5 days of socks, underwear, and undershirts. You are required to wear the uniform they provide you. They will give you 4 pairs of pants, 4 polo shirts, and 2 "workout" shirts. Plenty enough for 5 days. Other than the undergarments I packed a pair of jeans, a tshirt, a polo, and a 1/4 zip for our downtime. I wore my uniform down there just to make life easy because you are required to wear it on day 1.