The Marines of Battery M, 3rd Battalion, 14th Marine Regiment, Marine Forces Reserve, present the colors during a Purple Heart ceremony held in honor of Gunnery Sgt. Thomas J. Sullivan, Staff Sgt. David Wyatt, Sgt. Carson Holmquist and Lance Cpl. Squire Wells at the Hunter Museum of American Art in Chattanooga, Tenn., April 20, 2016. The Marines were honored for giving their lives to protect others when they were attacked by a gunman at the Naval Operational Support Center and Marine Corps Reserve Center in Chattanooga on July 16, 2015. (U.S. Marine Corps photo by MSgt. John Lee, II / Released) - The Marines of Battery M, 3rd Battalion, 14th Marine Regiment, Marine Forces Reserve, present the colors during a Purple Heart ceremony held in honor of Gunnery Sgt. Thomas J. Sullivan, Staff Sgt. David Wyatt, Sgt. Carson Holmquist and Lance Cpl. Squire Wells at the Hunter Museum of American Art in Chattanooga, Tenn., April 20, 2016. The Marines were honored for giving their lives to protect others when they were attacked by a gunman at the Naval Operational Support Center and Marine Corps Reserve Center in Chattanooga on July 16, 2015. (U.S. Marine Corps photo by MSgt. John Lee, II / Released)

Marines from Battery M, 3rd Battalion, 14th Marine Regiment, 4th Marine Division gather together as a class is given covering the fundamentals, functions and safety procedures of crew-served weapons at Pelham Range in Anniston, Alabama, on Sept. 19, 2015. The Marines applied all of their knowledge and increased their proficiency in firing the M249 SAW, the M240 and the M250. - Marines from Battery M, 3rd Battalion, 14th Marine Regiment, 4th Marine Division gather together as a class is given covering the fundamentals, functions and safety procedures of crew-served weapons at Pelham Range in Anniston, Alabama, on Sept. 19, 2015. The Marines applied all of their knowledge and increased their proficiency in firing the M249 SAW, the M240 and the M250.

Marines of Battery M, 3rd Battalion 14th Marine Regiment, Marine Forces Reserve, march together at the Methodist Church in Hixson, Tennessee, July 24, 2015. The Marines attended the funeral of their fallen brother, Staff Sgt. David A. Wyatt, one of five service members killed by a gunman at the Naval Operational Support Center and Marine Corps Reserve Center on July 16, 2015. Wyatt was taken to the Chattanooga National Cemetery after the church service to be laid to rest with full military honors. - Marines of Battery M, 3rd Battalion 14th Marine Regiment, Marine Forces Reserve, march together at the Methodist Church in Hixson, Tennessee, July 24, 2015. The Marines attended the funeral of their fallen brother, Staff Sgt. David A. Wyatt, one of five service members killed by a gunman at the Naval Operational Support Center and Marine Corps Reserve Center on July 16, 2015. Wyatt was taken to the Chattanooga National Cemetery after the church service to be laid to rest with full military honors.

Lt. Gen. Richard P. Mills, commander of Marine Forces Reserve, presents a folded flag to the widow of Sgt. Carson Holmquist, a motor transport maintenance chief with Battery M, 3rd Battalion, 14th Marine Regiment, 4th Marine Division, Marine Forces Reserve, during his funeral July 25, 2015 in Grantsburg, Wis. Holmquist, along with three other Marines and a Sailor, was killed in an attack at the Naval Operation Support Center and Marine Corps Reserve Center in Chattanooga, Tenn. on July 16, 2015. Marines, family, friends and the community of Grantsburg gathered to honor the memory and sacrifice of Holmquist and his fallen brothers-in-arms. - Lt. Gen. Richard P. Mills, commander of Marine Forces Reserve, presents a folded flag to the widow of Sgt. Carson Holmquist, a motor transport maintenance chief with Battery M, 3rd Battalion, 14th Marine Regiment, 4th Marine Division, Marine Forces Reserve, during his funeral July 25, 2015 in Grantsburg, Wis. Holmquist, along with three other Marines and a Sailor, was killed in an attack at the Naval Operation Support Center and Marine Corps Reserve Center in Chattanooga, Tenn. on July 16, 2015. Marines, family, friends and the community of Grantsburg gathered to honor the memory and sacrifice of Holmquist and his fallen brothers-in-arms.

The Marines of Battery M, 3rd Battalion, 14th Marine Regiment salute Staff Sgt. David A. Wyatt, who was a field artillery operations man with Battery M. Wyatt was laid to rest at the Chattanooga National Cemetery, July 24, 2015. Wyatt is one of five service members who died when a gunman attacked the Naval Operational Support Center and Marine Corps Reserve Center on July 16, 2015. Family and community members joined the Marines to pay their respects and thank Wyatt for his service to this country. - The Marines of Battery M, 3rd Battalion, 14th Marine Regiment salute Staff Sgt. David A. Wyatt, who was a field artillery operations man with Battery M. Wyatt was laid to rest at the Chattanooga National Cemetery, July 24, 2015. Wyatt is one of five service members who died when a gunman attacked the Naval Operational Support Center and Marine Corps Reserve Center on July 16, 2015. Family and community members joined the Marines to pay their respects and thank Wyatt for his service to this country.

Marines, family, friends and community members all gathered together to sing “God Bless America” at Lance Cpl. Squire Wells memorial at Sprayberry High School in Marietta, Georgia, July 21, 2015. Wells was one of the five military members killed by a gunman at the Naval Operational Support Center and Marine Corps Reserve Center in Chattanooga, Tennessee. Those closest to Wells remember him not only as a dedicated Marine but as a young man with contagious enthusiasm and a dedicated loving son. - Marines, family, friends and community members all gathered together to sing “God Bless America” at Lance Cpl. Squire Wells memorial at Sprayberry High School in Marietta, Georgia, July 21, 2015. Wells was one of the five military members killed by a gunman at the Naval Operational Support Center and Marine Corps Reserve Center in Chattanooga, Tennessee. Those closest to Wells remember him not only as a dedicated Marine but as a young man with contagious enthusiasm and a dedicated loving son.

The Marines of Battery M, 3rd Battalion, 14th Marine Regiment pose for a picture with Col. Joseph Russo, commanding officer of 14th Marine Regiment, in front of Schultz’s Battery M monument at Chickamauga and Chattanooga National Military Park in Fort Oglethorpe, Georgia, July 20, 2015. The Marines gathered together at the park to not only honor the Marines and Sailor killed by a gunman at the Naval Operational Support Center and Marine Corps Reserve Center, but to band together as a unit. - The Marines of Battery M, 3rd Battalion, 14th Marine Regiment pose for a picture with Col. Joseph Russo, commanding officer of 14th Marine Regiment, in front of Schultz’s Battery M monument at Chickamauga and Chattanooga National Military Park in Fort Oglethorpe, Georgia, July 20, 2015. The Marines gathered together at the park to not only honor the Marines and Sailor killed by a gunman at the Naval Operational Support Center and Marine Corps Reserve Center, but to band together as a unit.