NEW ORLEANS — Rear Adm. Roy A. Nash relieved Rear Adm. Mary E. Landry as commander of the Eighth Coast Guard District in an official change-of-command ceremony, Wednesday. Rear Adm. Landry assumed command of the Eighth District in June 2009, and will retire as both the Eighth District commander and as an active duty officer in the U.S. Coast Guard. As district commander, Landry was in charge...