Master Sergeant Duell's son Casper receives a Letter of Appreciation from Major Christopher Dettle, Operations Officer, Ground Supply School , Marine Corps Combat Service Support Schools, during the Master Sergeants retirement ceremony at Sneads Ferry, N.C. on May 2, 2014. Marines and civilians gathered at the retirement ceremony to commemorate Master Sergeant Duell for his 22 years of honorable service. (Combat Camera photo by Sergeant Mark E. Morrow/ Released)