Cosmonaut

"This war's getting worse. As World War III is getting worse on the Moon, we're on the Moon too. Now this war is getting worse than I've always thought."

--Su Ji-Hoon, To the Moon

A cosmonaut is a special trooper trained to fight in the hard vacuum of space during the Third World War. It is a campaign-exclusive unit, available only in the Soviet mission To the Moon to both the Soviet Union (or Russia) and Yuri's Army.

Background
"Gravity? What's that?"

--Bogachyov Pavlovich, impressed about being into the Moon, To the Moon