Capt. Jesse Black relieved Capt. Gregory Petrovic and assumed command as the 42nd commanding officer of the U.S. Naval Research Laboratory (NRL) during a
Petrovic Relieves Vigil as the 41st NRL Commander > U S Naval Research Laboratory > NRL News navy.mil - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from navy.mil Daily Mail and Mail on Sunday newspapers.