All seven members of the Joint Chiefs of Staff testified Tuesday on the need to slow growth in military compensation and apply dollars saved to underfunded readiness accounts for training, equipment and spare parts. But their united front for easing current budget burdens cracked over the notion of slashing savings for commissary shoppers. Marine Corps Commandant Gen. James Amos called the proposal to cut commissary appropriations from $1.4 billion yearly down to $400 million within three years, and the cut in average shopper savings from 30 percent down to 10 percent, “a sore point for me.” “That’s a 66 percent...