<Ul> <Li> Master - at - Arms 2nd Class Petty Officer (SEAL) Michael A. Mansoor †, Operation Iraqi Freedom, SEAL Team 3, 29 September 2006 </Li> <Li> Master - at - Arms 1st Class Petty Officer (EXW) John Douangdara †, Operation Enduring Freedom, United States Naval Special Warfare Development Group, 6 August 2011 </Li> </Ul> <Li> Master - at - Arms 2nd Class Petty Officer (SEAL) Michael A. Mansoor †, Operation Iraqi Freedom, SEAL Team 3, 29 September 2006 </Li> <Li> Master - at - Arms 1st Class Petty Officer (EXW) John Douangdara †, Operation Enduring Freedom, United States Naval Special Warfare Development Group, 6 August 2011 </Li> <Ul> <Li> Master - at - Arms 2nd Class Petty Officer Michael J. Brodsky †, Operation Enduring Freedom, 21 July 2012 </Li> <Li> Master - at - Arms 2nd Class Petty Officer Sean E. Brazas †, Operation Enduring Freedom, 30 May 2012 </Li> </Ul>

How long is us navy master at arms training