Can compression socks (black) be worn in APFUs during regular PRT?

DA Pam 670-1 and AR 670-1 does not specifically state that compression socks can/can't be worn. They state white or black socks without logos and no higher than calf length. I recommend you speak with your Commander to see if this is possible. However, I would also say be prepared to be told no.

If medically directed, shouldn't be an issue.