i asked cbp agri officials at jfk and iah about bringing in biltong. they said no. absolutely no beef of any kind can come in, and the iah agri officer listed out a bunch of beef products i've never heard of. doesn't matter if it's aged, sealed, raw, cooked, etc. both officers made it clear that no beef. but i also never asked about the usda variable. but i'd still assume no. but hey, if it's of no expense to you, try it. declare, be honest, and hope they overlook it at the exit.