Rehl, a veteran and the son of two Philadelphia police officers, was visible on various forms of media at the rally sporting a Temple University backpack. A photo posted online appears to show him inside the Capitol building with other rioters.
Investigators have detained over a dozen members of the Proud Boys to date over criminal events at the rally.
The group was founded in 2016 by VICE Media co-founder Gavin McInnes, who has since distanced himself from the group. The Proud Boys depict themselves as opponents of leftists, feminists, and Islam, while promoting a traditionalist “Western chauvinist” value system.