|Commanding officer of USS Memphis SSN 691, Commander Charles Maher, was relieved for the standard reason of "loss of confidence in ability to command"1.
Unofficially, a couple handfuls of submariners are under investigation for activity related to the compromise of the submarine basic engineering examination answer key3.
Captain Carl Lahti has replaced Commander Maher as the USS Memphis's captain. No allegations have been made that Commander Maher participated in or was aware of any compromise or cheating related to the submarine basic engineering examination.
UPDATED 02/05/2014 NavyTimes, Sailors suspected in spreading nuke cheating scandal and NBC, Nuclear letdown: Navy suspends 30 instructors at reactor school for alleged cheating
UPDATED 07/05/2012 CSM, Navy exam-cheating may fall into 'grey area'
NavyMil, USS Memphis Commanding Officer Relieved of Duty.
1. This is a catchall phrase that covers anything that is viewed as sufficient impediment of ones ability to lead submariner-sailors.
2. The Command-At-Sea pin is worn by the incumbent commander on the right and by the post successful tour commander on the left. What constitutes a successful tour is determined with considerably less publicity than the very public relief, removal, or loss of command. Generally a command tour interrupted or terminated by a removal for cause is not eligible for the Command-At-Sea pin as specified above (MILPERSMAN 1210-170, Command at Sea Insignia: Qualifications).
3. Former submarine junior officer Christopher Brownfield in his recent memoir, My Nuclear Family alleges compromise of the submarine basic engineering examination answer key and widespread cheating.