This 1953 NACA High-Speed Flight Research Station photograph shows the Douglas D-558-2 #2 Skyrocket (NACA 144), prior to flight, being towed under the P2B-1S launch vehicle (NACA 137) for attachment. The photograph also shows the large hydraulic jacks used to elevate the P2B-1S launch vehicle. Once the D-558-2 was in position, the P2B-1S would be lowered and the attachment made.