These are photographs taken by George Smoot of the U2 pilots
in preparation for the flights in Peru.
BBC 794 4331 Pilot sitting in back of wagon
You can see the "space suit" and the portable oxygen containers.
The pilots used the oxygen preflight for two reasons:
(1) to pre-breathe in order to prepare them for altitude
to which they ascended very rapidly, and
(2) cooling, which was especially needed in the heat of Lima.
BBC 794 4345 U2 Pilot being assisted in to parachute pack
and other flight equipment. You can see the oxygen tube
coming to the chest of the space suit.
BBC 794 4333 U2 pilot in cockpit
I (George Smoot) moved in close to try and get a good picture
as the pilot completed check out.
You can see the Anisotropy instruments in stored position and the
tail of another aircraft.
for more photographs and information about the U2 DMR instruments.