CNN LIVE: Tune in Wednesday at 8 p.m. ET for the last presidential debate before Super Tuesday, the CNN/Arizona Republican Party Debate hosted by John King. Follow it on Twitter at #CNNDebate <https://twitter.com/#!/search?q=%23CNNDebate> and on… more »

By Barbara Starr, CNN Pentagon Correspondent Washington (CNN) -- The Navy has already relieved so many commanding officers of duty this year that the chief of naval operations has written an unusual memo to all potential commanders reminding them of th… more »