Flickr – Photo Sharing SATCOM (Defense Satellite Communications System) Following instructions on the Defense Advanced Global Positioning Satellite Receiver Medical records using the MC4 handheld device The Sentinel, a systems that can provide Internet, digital and analog communications down to the police officer or firefighter level on the street. monitoring the Force XXI Battle Command Brigade-and-Below and Remote Weapons System screens Stryker Transport vehicle Operation Jump Start preparing the joint network node (JNN) Bild: Army.mil