This was announced by a former NASA employee and space engineer flying Clark McClelland (McClelland) who worked on space programs from Mercury in 1961 until launch International Space Station. He was personally acquainted with astronauts from day one and has some amazing first-hand evidence and UFO sightings. 
Photos from open sources
Clark made an official statement on his website. IN in particular, he writes: “I, Clark S. McClelland personally observed an alien 8 to 9 feet tall in my 27 inch video monitors in office in the space Kennedy Center, Launch Control Center (LCC). Alien stood vertically in the cargo compartment of the shuttle and debated with two American astronauts NASA! I also noticed on my monitor an extraterrestrial spacecraft that has been stabilized on safe orbit on the back of the Space Shuttle. I watched this incident for one minute and seven seconds. Enough time to remember everything that I watched. It was an alien and extraterrestrial spaceship! A friend of mine later contacted with me and said that he also observed an alien from 8 to 9 feet high inside the space shuttle’s fighting compartment! Yes in our shuttle! Both missions related to secret meetings of the Ministry Defense (Pentagon) TOP SECRET (TS)! .. I am an expert in visual identification of any aircraft created by the human race, whether it be secret or other constructions! I can get to know an alien ship when I see it! “Clark S. McClelland reports that he wrote three books with the goal of conveying what is known to him information to the rest of humanity. He met with many astronauts of NASA and other countries for many years, and has been Involved in NASA’s military space programs from 1958 to 1992! Clark says he has heard of numerous observation experiments more than once aliens, including on the moon, from NASA astronauts.
NASA time
