Typical doctrine for multiple ship operations in the H-53 called for the wingmen to get on the ground first during the landing phase. This insured, assuming landing into the wind, that the dust and crud from the leading aircraft minimally affected the wingmen. The reverse took place on takeoff. The wingmen would lift off first and gain step up prior to the leader’s lift off.
We were also trained to never fly directly over another aircraft while it was running.