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I searched for a thread like history of Soviet tank,to no avail.....I am interested how does replacing/upgrading AFVs practice works in US Army.I obtained R.P Hunnicutt book on Patton,which gave me the idea about introduction dates and various upgrades for Pattons.I had to search elsewhere for other vehicles.However,it is unclear to me how upgrading proceeded,what happened to older vehicles? Example,M113 was produced in three improved version. A1 (1964); A2 (1979); A3 (1987) ...however,what happened to A1 when A2 introduced? They all were upgraded? NG received them? Scraped or transformed into new versions? Or M1 Abrams. All variants served together in,let's say,1992.Then,I think,remaining 105mm were upgraded to 120mm Now,this is the tank list I have,which is the entire point: M48A1 (until December 1979?) M48A3 M48A5 (October 1975-mid '90) M60 (fall of 1960-1963?) M60A1 (1963-1972?) (basic version) M60A1(AOS) (late 1972-1975)) M60A1(RISE) (1975-77?) M60A1(RISE/PASSIVE) (1977-1997?) M60A1 ERA (late '80) M60A2 "Starship" (1974-1981) M60A3 (May 1979-upgraded with TTS couple of months later?) M60A3 (TTS) (August 1979-1997) M1 (1984-1992?) M1IP (1984-1992?) M1A1 (August 1985) M1A1 HA (October 1988)

The Arat 1 panels are thin enough to not have an effect on the frontal profile of the M1 Abrams while making it much stronger against modern threats without increasing the weight a significant amount