A 50 mile hike involving who knows how many people of varying physical states...think of the support staff for this event. If anything, that alone justifies making this a 3 day event. Outside of a few units, how many folks will get wrecked by 50 miles in 3 days? Traffic control, medical, the obligatory press coverage, disruption of traffic in and around base...yeah, you almost have to make this a 3 day event. It is a morale/ nostalgia thing, not training or SMU selection.