Legendary U.S. astronaut Buzz Aldrin indicated support for Republican Sen. Martha McSally in her Arizona race against Democratic challenger Mark Kelly, a retired astronaut.

“Martha, check six – Mark? Buzz – over 100 jet hours in Arizona,” Aldrin said on Twitter. “12 o’clock is straight ahead. 6 o’clock is behind. Fighter pilots understand what ‘check six’ means in FTR lingo talk. Martha, wave as you move ahead past Mark, to 12 o’clock, and you win for Arizona!”