The Marine Corps is on the defensive for a second time this month over changes to its famous Infantry Officer Course (IOC). Military communities were abuzz in early February when officials confirmed that successfully completing the Combat Endurance Test (CET) — the rigorous first stage of IOC — would no longer be a requirement for passing the 13-week course. The Corps answered criticism on Feb. 7, but found itself in the same position this week as new standards for IOC’s training hikes were revealed. The course previously required a Marine to complete nine hikes, of which six would be evaluated...