The ages of most World War II veterans are now reaching into the 90s, and six of these veteran-heroes who recently died deserve special mention in this column today because of their unique wartime exploits and extraordinary service to our country. The six were aged from 90 to 96, three were enlisted men, three were officers, two served in the Navy, three in the Army and one in the Army Air Corps. I knew one of these men, Watson Sims, at 90 the youngest in the group. Sims, a Navy radioman, won a Silver Star for helping evacuate Gen. Douglas …