Tactical communications, not just for SIGINT, are "flattening", such that units do not just report up their chain of command, but to adjacent units. One of the rationales for doing so is that a combat unit can see an opportunity and move against it, without it being misidentified by a neighboring unit and being engaged with "friendly fire." Prophet Block II adds electronic attack (EA) capability to Prophet, while Block III upgrades the Prophet receiver to collect against advanced and special signals. These enhancements will be coordinated with UAVs and tactical aircraft with expanded SIGINT capability. Blocks IV (expected IOC 2008) and V (expected IOC 2015)  add MASINT along with micro-and robotic receivers to the Prophet Ground system. MASINT will include ground surveillance radars (PPSSD) and the Improved—Remotely Monitored Battlefield Sensor System (I-REMBASS) aboard a shelter-mounted HMMWV. Prophet, with the I-REMBASS monitoring system, will form the Ground Sensor Platoon of the brigade combat team Reconnaissance, Surveillance, and Target Acquisition (RSTA) Squadron. Prophet Air will begin in a UAV. For SIGINT operations, the basic US Marine augmentation to Force Recon is a 6-man detachment from a Radio Reconnaissance Platoon. There is a SIGINT platoon within the Intelligence Company of the new Marine Special Operations Support Group. Army Special Forces have the Special Operations Team-Alpha that can operate with an SF team, or independently. This is a low-level collection team, which typically has four personnel . Their primary equipment is the AN/PRD-13 SOF SIGINT Manpack System (SSMS), with capabilities including direction-finding capability from 2 MHz to 2 GHz, and monitoring from 1 to 1400 MHz. Subordinate to Radio Battalions, US Marines have a multifunction AN/MLQ-36 Mobile Electronic Warfare Support System that gives the operators limited armor protection. It contains  The AN/PRD-12 is a tactical, man-transportable system that provides search, intercept, and DF on communications signals in the HF/VHF/UHF bands. Up to four PRD-12 stations can be networked, providing DF data to a mission control station via radio link with single-channel ground and airborne radio system (SINCGARS) equipment. Any of the four stations can act as mission control. Assigned 1 per Marine Division, 1 per Marine Air Wing, and one per Radio Battalion, the AN/MSC-63A is a shelterized communications switch that provides a secure semiautomated data communications switch and terminals for the processing of general service (GENSER) or defense special security communications system (DSSCS) sensitive compartmented information (SCI) record message traffic.