![File:U.S. Army Master Sgt. Robert Longacre, left, an observer-controller with the 1st Battalion, 4th Infantry Regiment, guides an Estonian soldier during a simulated training exercise lane at the Hohenfels Training 140827-A-ZZ999-004.jpg - File:U.S. Army Master Sgt. Robert Longacre, left, an observer-controller with the 1st Battalion, 4th Infantry Regiment, guides an Estonian soldier during a simulated training exercise lane at the Hohenfels Training 140827-A-ZZ999-004.jpg -](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e4/U.S._Army_Master_Sgt._Robert_Longacre%2C_left%2C_an_observer-controller_with_the_1st_Battalion%2C_4th_Infantry_Regiment%2C_guides_an_Estonian_soldier_during_a_simulated_training_exercise_lane_at_the_Hohenfels_Training_140827-A-ZZ999-004.jpg/640px-thumbnail.jpg)
File:U.S. Army Master Sgt. Robert Longacre, left, an observer-controller with the 1st Battalion, 4th Infantry Regiment, guides an Estonian soldier during a simulated training exercise lane at the Hohenfels Training 140827-A-ZZ999-004.jpg -
![U.S. Army Capt. Don Galster, Lead MISO observer-controller - PICRYL - Public Domain Media Search Engine Public Domain Search U.S. Army Capt. Don Galster, Lead MISO observer-controller - PICRYL - Public Domain Media Search Engine Public Domain Search](https://cdn2.picryl.com/photo/2012/10/17/us-army-capt-don-galster-lead-miso-observer-controller-fbf4d1-1024.jpg)
U.S. Army Capt. Don Galster, Lead MISO observer-controller - PICRYL - Public Domain Media Search Engine Public Domain Search
Observer controller/trainers provide valuable feedback, oversight to medics > U.S. Army Reserve > News-Display
![U.S. Soldiers with the Raptor Observer Controller Team and Soldiers with D Troop, Regimental Engineer Squadron, 2nd Cavalry Regiment discuss a follow up mission during Exercise Allied Spirit VII at the 7th U.S. Soldiers with the Raptor Observer Controller Team and Soldiers with D Troop, Regimental Engineer Squadron, 2nd Cavalry Regiment discuss a follow up mission during Exercise Allied Spirit VII at the 7th](https://c8.alamy.com/comp/KK886A/us-soldiers-with-the-raptor-observer-controller-team-and-soldiers-KK886A.jpg)
U.S. Soldiers with the Raptor Observer Controller Team and Soldiers with D Troop, Regimental Engineer Squadron, 2nd Cavalry Regiment discuss a follow up mission during Exercise Allied Spirit VII at the 7th
Observer controller/trainers provide valuable feedback, oversight to medics > U.S. Army Reserve > News-Display
![An observer-controller watches as U.S. Army Military - PICRYL - Public Domain Media Search Engine Public Domain Search An observer-controller watches as U.S. Army Military - PICRYL - Public Domain Media Search Engine Public Domain Search](https://cdn2.picryl.com/photo/2017/09/07/an-observer-controller-watches-as-us-army-military-8b9de0-1024.jpg)
An observer-controller watches as U.S. Army Military - PICRYL - Public Domain Media Search Engine Public Domain Search
![An observer controller trainer resets the war-gaming equipment soldiers use to fight on the simulated An observer controller trainer resets the war-gaming equipment soldiers use to fight on the simulated](https://media.defense.gov/2012/Jan/30/2001169506/-1/-1/0/214194-J-TYV41-579.jpg)
An observer controller trainer resets the war-gaming equipment soldiers use to fight on the simulated
![U.S. Army Soldiers acting as Observer Controller Trainers - PICRYL - Public Domain Media Search Engine Public Domain Search U.S. Army Soldiers acting as Observer Controller Trainers - PICRYL - Public Domain Media Search Engine Public Domain Search](https://cdn2.picryl.com/photo/2016/07/05/us-army-soldiers-acting-as-observer-controller-trainers-04bca7-1024.jpg)
U.S. Army Soldiers acting as Observer Controller Trainers - PICRYL - Public Domain Media Search Engine Public Domain Search
![Major Josh Monteiro, an observer/controller/trainer - PICRYL - Public Domain Media Search Engine Public Domain Search Major Josh Monteiro, an observer/controller/trainer - PICRYL - Public Domain Media Search Engine Public Domain Search](https://cdn2.picryl.com/photo/2020/08/21/major-josh-monteiro-an-observercontrollertrainer-308728-1024.jpg)