![](https://www.historynet.com/wp-content/uploads/2016/10/XP-79-crosby-960_640.jpg)
Harry Crosby stands inside the MX-334 during a lull in unpowered gliding tests in early 1944. Access hatches on the top and bottom gave Crosby a unique opportunity to add scale to the glider as it rested on the parched, cracked surface of Muroc Dry Lake. (USAF Flight Test Center Archives)