I worked on the Delta IV Heavy, the only 3 abreast rocket in the air force launch system.
I did XYZ servo alignment of the "tubes" of the rocket to join them on a moving line.
240 feet tall.
Mostly used to launch Heavy Defense stuff way up high.
Rocketdyne RS-68 motors, three of them, 68 thousand pounds thrust each.
Turbo pumps to feed the liquid O2 and liquid Hydrogen to the engines were 3000 horsepower each.
No nasty Benzines or Kerosenes, just Oxygen and Hydrogen makes steam and thrust.
