Loadies
If you mean "Load Masters" then use those words, please.
"Loadie" is a common term used in the US military for loadmasters (which is one word, not two.) There was a National Airlines loadmaster on the airplane, and he would have been responsible for supervising the loading and checking the restraints and, possibly, computing the weight and balance. I say "possibly" because its done using computers now, and the position of the load is planned before it reaches the airplane.