Transcribed from back of photo: "Howard Hughes in the cockpit of the new XF-11 reconnaissance plane which he designed and built in conjuntion with Air Material Command engineers. He is preparing for its first flight. One of the world's fastest long-range photo planes, it can attain a speed of over 400 miles per hour."

Engineers test radar equipment at the Hughes Aircraft Company in 1959.

From the Sister Klaryta Antoszewska Photograph Collection (PH-00352). The presentation slide lists the steps required to conduct atmospheric and underground bomb tests. 

From the Sister Klaryta Antoszewska Photograph Collection (PH-00352). The presentation slide title reads, "Underground nuclear test execution sequence"

From the Sister Klaryta Antoszewska Photograph Collection (PH-00352). The presentation slide title reads, "Comparative Radiation Exposures"

From the Sister Klaryta Antoszewska Photograph Collection (PH-00352). The presentation slide reads, "Total announced tests and radiation measured off the test range complex"

From the Sister Klaryta Antoszewska Photograph Collection (PH-00352). The presentation slide reads, "Total announced tests and radiation measured off the test range complex"