Marine Sgt. Nicole Gee celebrated the joy of service just days before she was one of 13 U.S. service members killed in Thursday's suicide bombing attack near Kabul's Hamid Karzai International Airport. A week ago, Gee, 23, posted a photo on Instagram that showed her holding a baby at that airport. She added a simple, profound comment: "I love my job." The same photo was posted by the Department of Defense on Aug. 21. Gee, from Sacramento, California, served as a maintenance technician with the 24th Marine Expeditionary Unit from Camp Lejeune in North Carolina. On her Instagram page, she described herself as a "positive mental attitude advocate." The locations listed on her page include California, North Carolina and "somewhere overseas." Gee was remembered by Sgt. Mallory Harrison, a fellow Marine who roomed with her for more than three years, in a Facebook post accompanied by more than a dozen photos. "My best friend. 23 years old. Gone. I find peace knowing that she left this world doing what she loved," Harrison wrote. "She was a Marine’s Marine. She cared about people. She loved fiercely. She was a light in this dark world. She was my person. … Til Valhalla, Sergeant Nicole Gee. I can’t wait to see you & your Momma up there. I love you forever & ever." Story by Bill Keveney. Photo by @apnews