RAF PR image
Every RAF Chinook trainee aircrew - pilots and loadies - had to qualify on triple-USLs prior to finishing the OCU course. A favourite exercise was with the RA 105mm light gun, where you land to pick up the gun crew then lift to the hover and pick up the ammunition, the 1-tonne LR and the gun. I was surprised to learn that in the US Army at the time I was operating on type (1989-1997), carrying USLs was considered an advanced skill that was covered after pilots had started Sqn service; don't know if that was true.