1972 - Apollo 16, Moon Mission, UFO at top right of photo.

1972 - Apollo 16, Moon Mission Dates: April 16-27, CDR: John W. Young, CMP: Kenneth Mattingly, LMP: Charles Duke, Importance: Explored the Moon's rocky central highlands. NASA archives (photo No AS16-109-17804) Mission Apollo 16 on the Moon. Astronaut John Young on rim of Plum crater gathering lunar rock samples. UFO at top right.

1971 - September 4 - An official mapping aircraft took this photograph.

1971 - September 4 - An official mapping aircraft of the Costa Rican government took this photograph. The aircraft was flying at 10,000 feet over Lago de Cote. An investigation could not identify the object as any "known" aircraft. Debunkers took some stabs at it, but it is still recognized as authentic by investigators. One of the few photographs of a UFO in or near water.
Personally I think that this is not a UFO but rather a 1970's pin staple used to keep pages together?

Lago Cote, Alajuela, Guatuso, Costa Rica