Nuclear testing at Bikini Atoll consisted of the detonation of 23 (or 24) nuclear weapons by the United States between 1946 and 1958 on Bikini Atoll in the Marshall Islands. Tests occurred at 7 test sites on the reef itself, on the sea, in the air, and underwater. The test weapons produced a combined yield of about 77–78.6 Mt of TNT in explosive power. After the inhabitants agreed to a temporary evacuation, to allow nuclear testing on Bikini, which they were told was of great importance to humankind, two nuclear weapons were detonated in 1946. About ten years later, additional tests with thermonuclear weapons in the late 1950s were also conducted. The first thermonuclear explosion was much more powerful than expected, and created a number of issues, but did demonstrate the dangers of such devices.
From Library of Congress.
I believe the black thing is part of the plane further back, and he's preparing to get a shot.
I think the black thing is the horizontal stabilizer of a North American B-25 Mitchell. The wiki mentions that there were variants made for photography and reconnaissance.
Nice find! I figured it was something like that, but wasn't sure how to find the plane.