This is the space testing center where the Apollo 4 Control RCS rocket engine at the NASM museum came from.

-It's actually an engine from the Rocketdyne Division of the Rockwell Int. Corp.

“Apollo Engine and its Command Ship”

-The Apollo RCS system actually had 12 of these engines with which it maneuvered 4 laps around the Moon and re-entered the Earth. These engines could pulse or run continuously for up to 30 minutes enough for each mission.