"Photograph of John Wilkes Booth and others from Otto Eisenschiml's book 'Why was Lincoln murdered.'"
"A series of seven photographs of John Wilkes Booth with others."
Has anyone ever come across any of their identities? My best guess is that Booth is posing with other actors and that the two men in uniform wouldn't be actual officers.
This page which claims to have every known Booth photo has an additional one of Booth with two of the men: http://boothiebarn.com/picture-galleries/jwb-photos/