“Nonetheless, some prototype chimp suits had been developed, including the “SPCA Suit”—certified humane by the Society for the Prevention of Cruelty to Animals. “To prove that a suit was safe for a man, we were going to test it on a chimp, but to prove the suit was safe for a chimp, we had to test it on a man,” U.S. Spacesuits coauthor Joe McMann said in an email. “That was a mind boggler.”