Finally! US Army Tests Newest M1 Abrams SEPv4 Super Tank After Upgrade

M1 Abrams SEPv4: The U.S. Army’s Plan To Build The Ultimate Tank. A new version of the M1A2 Abrams main battle tank, which has been a US Army lynchpin for over forty years, is currently under development. The new version, the SEP version 4, or SEPv4, will feature several modernization upgrades, and should allow the Abrams to serve for decades still.