Technicians servicing the Bell Aircraft Corporation X-1 in preparation for a flight. The X-1 is mated with the Boeing B-29. The hooks and strap that holds the X-1 in place under the B-29 can be seen just above the hand of the technician with the hose. The strap continues under the belly of the X-1 and holds the aircraft to the mothership until the word comes to ''launch'', and then the shackles are released.