The core telecommunications capabilities supported by GSM-O enables the Warfighter to meet operational needs by providing world-wide telecommunications, supporting natural disaster relief, and conducting humanitarian assistance in peace time crises, regional conflicts, and at the same time executing on-going strategic deterrence activities. + Configure, test, install, troubleshoot, and maintain network devices, phone systems, including phone units, voicemail, switches, infrastructure, call manager systems, Video Teleconference (VTC) systems video recording/viewing/distribution systems, and related telecommunications trunk circuits.