I received confirmation today that the vertical signature to the right of center belongs to Seymour Kopels. See below:
"Seymour Kopels is correct. He was a tail gunner on the James B. Carter Crew in the 786th BS. He passed away in 2003. You can see the information I entered about him on the AAM database here: http://www.americanairmuseum.com/person/204002. Nova at and Simek were on the Bill Tikey Crew in the 785th BS. rapuano was on the Robert Taylor Crew. Both the Taylor and Tikey Crews became lead crews and likey did that training with the 44th BG then returned to the 466th BG. Not sure about Stuart and Cowan - Chris Brassfield 466th BGA Historian"