Redstone Training at Fort Sill, Oklahoma
46th Artillery Group
3 February 1959
left to right: SFC Willey H. Slaughter, from Athens, Georgia and SFC Allen W. Dillingham, from Terre Haute, Indiana
SFC Dillingham is inside the skirt section of the aft unit, pointing to the thrust unit/aft unit electrical connector interface.
Note the 3 air spheres - later upgraded to 2 larger capacity spheres - , pressurized before flight to 5,000 psi, used for computer air-bearing surfaces and aft unit control jets.
The 4 "cake pan" cylinders are the aft unit control vane actuators.