sickness had everybody worried ... it didn't seem like a good idea to put him back in ... at this point." Following his mission, Schweickart "basically called the shot that I really didn't want to be assigned to a flight until we knew more about motion sickness" and became "[a] motion sickness guinea pig" for six months; while "[he] didn't learn that much" during the testing, it is now accepted that as many as half of space travelers suffer from space adaptation syndrome to some extent. The protracted testing period also contributed to Schweickart not being assigned to the Apollo 12 backup crew. When he returned to Houston, "Al Shepard [Slayton's deputy], for whatever reason, instead of putting me back on Apollo, put me on to Skylab ... Al had his own agenda of who went where and whatnot. So I cycled into Skylab at the time." Schweickart has also observed that he was "not one of Al's boys", alluding to the political liberalism that he shared with his then-wife, Clare; Slayton felt that her fervent political stances (including civil rights activism) "caused him a few problems with his colleagues." During this period, a Houston radio broadcaster characterized Schweickart as "the closest thing to a freak astronaut" after he was photographed escorting Maharishi Mahesh Yogi on a tour of NASA's headquarters. Along with backup science pilot Story Musgrave and backup pilot Bruce McCandless II, Schweickart was assigned as backup commander of Skylab 2, the first crewed American space station mission, which flew during the spring of 1973. Following the loss of the space station's thermal shield during launch, he assumed responsibility for the development of hardware and procedures for erecting an emergency solar shade and deploying a jammed solar array wing, operations that saved the space station. After serving on the support crew of Skylab 4, Schweickart was more interested in cultivating managerial skills than "[going] over to the Space Shuttle development work which was under way ... by that time, I had, you know, done a lot of work on Gemini in a support role, and then, of course, everything on Apollo, and now all of this on Skylab, and to go cycle back into the very beginning of the Space Shuttle, which was not going to fly for, at that point, something like six years and best guess of anybody in the business was maybe eight years, I