The US Marine Corps being Marines do things differently. This includes their burial details which differ from that of all the other armed services. For instance, they only use six casket bearers and not the usual eight that the other services use. As such, the Marines selected for this position tend to be, shall we say, beefy.
Before they are selected for the Body Bearers Section, Marines go through months of training at the Ceremonial Drill School. The average training time for a Marine before being selected as a Body Bearer is from six to 12 months. To be selected, the Marine must be a corporal or lower in rank and pass exacting strength standards.
They call themselves “the last to let you down”.