A3D Skywarrior Third Crewman

From Naval Aviation New, May 1960:

Note that "weaponeer" was the crew member assigned to arm a nuclear weapon after takeoff. Navy officers had this responsibility on the Hiroshima and Nagasaki missions.

Paul Bless provided more information on the individuals listed above: Shelly and Szeller were misspellings; their last names were Skelly and Szeyller.  Greenwood and Skelly went on to become A3D bombardier/navigators (see the Naval Enlisted Bombardier/Navigator Association website). Szeyller became one of the first F4H RIOs and was killed in a midair collision with another F-4 in 1967.