Observer Signals Marine Corps 1st Lt. Kylee Daitz trains as a joint fire observer during exercise Winter Fury 21 in California, Jan. 29, 2021. Joint fire observers are responsible for requesting, controlling and adjusting close air support fire such as artillery, mortars, and naval surface gunfire. SHARE: Download: Full Size (2.22 MB) Tags: Marine Corps Credit: Marine Corps Sgt. Kevin Rivas VIRIN: 210129-M-GH531-0200T.JPG Photo Gallery