Junior Officers graduate from OCS with the rank of 2nd Lieutenant ( 2LT ) .
Junior Officers are usually promoted to Lieutenant ( LTA ) when they are two months or so before they complete their full - time National Service .
Junior Officers graduate from OCS with the rank of 2nd Lieutenant ( 2LT ) , and are usually promoted to Lieutenant ( LTA ) when they are two months or so before they complete their full - time National Service .