In the 1970's women service members were not allowed to serve at the Minot Air Force Base in North Dakota, because it was "too cold." Times have changed. Yesterday, on orders from Congress to review gender assignments, the Pentagon opened some 14,000 combat-related positions to women. But 238,000 — one-fifth of all jobs for the active military — are still limited to men only. Nancy Duff Campbell is co-President of the National Women's Law Center.