Pictured are: (L-R, front) John Glenn; Scott Carpenter; and Donald Slayton; (behind Schirra) Gus Grissom; Neil Armstrong; Tom Stafford; and Alan Shepard. Jim Lovell is standing in foreground.
The guy you identify as Armstrong I think is Frank Borman. The person to the right of Slayton (Slayton's left) I think is Elliott See, and the guy behind Slayton looks like it might be Jim McDivitt. Also, the man in the forground is definitely not Jim Lovell, though that may be Lovell's head poking out from behind his shoulder.