Easting

https://en.wikipedia.org/wiki/BMP-1
http://www.military-today.com/tanks/t72.htm
https://en.wikipedia.org/wiki/M1_Abrams#Primary
https://www.army-technology.com/projects/abrams/
https://en.wikipedia.org/wiki/Battle_of_73_Easting
https://nationalinterest.org/blog/the-buzz/10-lessons-the-battle-73-easting-15332
http://www.historynet.com/learned-battle-73-easting.htm
https://www.warhistoryonline.com/featured/battle-73-easting.html/2
https://en.wikipedia.org/wiki/Bradley_Fighting_Vehicle#M2_Bradley