year, sparking a new feud in the tennessee hills. in app lach a, john roberts. gi jane could be a few years away. they plan to allow women in combat roles, elite army rangers and s.e.a.l.s. jennifer griffin on tearing down the glass ceiling on the battlefield. >> reporter: the pentagon is a step closer in opening combat positions to mission, laying ground work for them to enter rangers and navy s.e.a.l.s, some hurdles remain. this summer, the marines plan to test 400 male and 400 female marines to find a way to screen recruits, ensure those entering combat can succeed carrying out 250 physically demanding tasks. the special operations community says physical differences aren't their biggest concern. >> looking for smart, qualified operators. there's a new dynamic.