![]() If the IFF return is positive, the weapon will let the soldier or vehicle pass otherwise it will open fire. All Colonial Marine personnel and vehicles carry an IFF transponder in their communications gear which sends back a coded radio signal when interrogated. When set to Auto-Remote, the sentry will interrogate all targets in its sensor cone using an Identification Friend Foe (IFF) transponder. The UA 571-C has three operating modes - Auto-Remote, Manual Override and Semi-Automatic. The information collected by the UA 571-C's sensor is automatically relayed to the visual support systems of nearby soldiers, enabling them to see cloaked Yautja as if they were uncloaked. The sensors used by the UA 571-C are able to detect Yautja even when cloaked. However, the system is usually set to multi-spectral mode, where the sentry's software cross-correlates received data from the different sensors to obtain a full target profile. If a target's visual or thermal profile is known, the system may be pre-set to scan for only these specific targets using infrared or optical. This sensing suite consists of a cooled infrared detector in the 3-5 µm and 8-13 µm band, ambient light optics, an ultrasonic motion tracker and a lidar. The sentry unit's sensor array is mounted above the barrel, aligned to cover a 60° cone in front of the weapon. The weapon has a cyclic rate of 1,100 rpm and is air cooled, with an automatic cutout preventing the loading of any more rounds into the breech should overheating cause a chance of ammunition "cook-off". The UA 571-C mounts the pulse action M30 Autocannon firing the 10×28mm High Explosive Armor Piercing round used by the Corps' M56 Smartguns. Once emplaced, the system may be set to sweep wide arcs up to 360° (subject to terrain and emplacement restrictions), though doctrine is to set several sentries to cover smaller, interlocking fields of fire on a narrow frontage. A microwave datalink connects the sentry to a remote command console. The major components consist of a snap-open tripod mounting, battery pack, breech and barrel assembly, sensor unit and 500-round ammunition drum. Each remote sentry unit weighs in at 19.6 kg and can be assembled in under 150 seconds. ![]()
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