Since August of 2007 when I came back in the Army, I have been in Echo Company of 2-104th Aviation. Echo has all the fuelers, but in almost five years,today was the first time I fueled an aircraft myself. It was "Cold" fuel: that is when the helicopters engines are shut down. The other option is hot fuel--the NASCAR pit stop style of fueling where the aircraft is fueled while the blades are turning. As soon as fueling is completed, the aircraft takes off.
Here is a photo of two Chinooks getting hot fuel at Schuykill County Airport