Following the cessation of hostilities in Europe, the unit was reorganized as the 2nd Constabulary Regiment, performing security, border patrol, and civil administration duties in the American Zone of occupied Germany. As the geopolitical division of Europe solidified, the unit was redesignated as the 2nd Armored Cavalry Regiment (2nd ACR) in 1948 and returned to a tactical defense mission.
From 1958 until the fall of the border fortifications in 1990, the 2nd ACR was tasked with the surveillance and defense of a 385-kilometer portion of the Inner German Border and the Czechoslovak border. Operating from forward cavalry camps along the border, the regiment conducted continuous ground and aerial surveillance to monitor Warsaw Pact military activity and deter potential aggression. This border surveillance mission lasted for over three decades, representing the longest continuous deployment in the history of the regiment.
The daily operations along the Iron Curtain required constant vigilance. Troopers operated from forward outposts, utilizing observation towers, ground surveillance radar, and aviation overflights to maintain a continuous, 24-hour watch over the frontier. In the event of an invasion, the regiment was tasked to act as a covering force, designed to absorb, disrupt, and delay a massive Soviet armored offensive to allow NATO's main defense forces the critical time needed to mobilize.
To maintain its deterrent capability, the regiment underwent continuous technological modernization throughout the Cold War era. The 2nd ACR transitioned through multiple generations of combat vehicles, moving from the M48 and M60 series tanks to the M1 Abrams main battle tank, and from M113 personnel carriers to the M3 Bradley Cavalry Fighting Vehicle. This commitment to fielding advanced weaponry ensured the regiment remained one of the most lethal tactical units stationed in the European theater.