I was a crew chief and ultimately a production supervisor on C-5's. I loved the aircraft as it was a thinking person's aircraft. It had a ton of different systems that other aircraft simply don't have and you were always learning something new about it.
I was a C-5 maintenance troop in the 80's and then went on to finish collage and was selected to attend OTS and pilot training. I was assigned to fly the C-5 at both Travis and Dover. The nitrogen system described in the video was done so incorrectly, yes nitrogen is used in landing gear struts, but the servicing of the system in the video is the system that fills the fuel cells as fuel is burned off to make the fuel cells non explosive. It also serves as a fire fighting system for under floor and gear wells.
We were at an air show in Mt Home, Idaho. A C5 was on tarmac so folks could wonder around it and walk inside. We had a sudden summer thunderstorm. Everyone headed to that plane and there was an unbelievable number of people who sheltered inside that plane to wait out the storm. These things are HUGE!
Beautiful engineering. My mobile training unit was moved from Nouasseur Air Depot in Morocco to Wheelus AB in Libya in 1957 using just one C-130. It was an impressive plane then to this 22 year old airman. Took the place of four C-119s.
My friend was in Iraq and he told me how large the C5 Galaxy was. He showed me a few photos today that his unit took while in flight to Iraq and the inside was damn massive.