The Long Range
Surveillance Unit does NOT have the same role as the Long Range
Reconnaissance Patrol company.
A LRRP Company was typically comprised of 3 platoons of 5 or 6 (depending on unit
strength, not MTOE) 4- to 5-man LRRP teams. Division LRRP Companies were flagged as Ranger (LRRP) Companies in 1969. In the Texas Army National Guard (G Company (Ranger)(Long Range Reconnaissance Patrol), 143rd Infantry, this included a Pathfinder and Rigger platoon.
LRSUs are now typically in an Intelligence Battalion (at Division or Corps) or Reconnaissance, Surveillance, and Target Acquisition Battalion in a deploying Brigade Team.
Modern commanders are averse to putting human intelligence gatherers on the ground, and the actual employment of LRSUs has suffered (their role will probably eventually be replaced by the extended loiter UAV).
Company D (Long Range Patrol), 151st Infantry, Indiana Army National Guard deployed to Vietnam in December 1968 and was attached to the 199th Infantry Brigade (Separate) (Light). The 151st was one of the very, very few National Guard ground combat units to deploy to Vietnam.
In 1969 it was redesignated as Co D (Ranger), 151st Infantry and assigned to II Field Force Vietnam. When Co D (Ranger), 151st rotated back to the Indiana Guard the assigned Regular Army troops formed the nucleus of the concurrently constituted and activated Co D (Ranger), 75th Infantry.
Sua Sponte. Rangers Lead the Way.