The Abrams tank is going on 40 years of use, do you want an early 80s Cold War tank (M1, M1IP), late Cold War/Desert Storm (M1A1, M1A1 heavy common), early Iraqi invasion (OIF) M1A1 heavy common, M1A2, later Iraqi war use (M1A1AIM, M1A2SEP)?
There is a website dedicated to 1/72 scale plastic soldiers. Go to this site, click the "periods" link on the right and select "modern" at the bottom of the page. Then you'll see some manufacturers, some with photos of the figures.
http://www.plasticsoldierreview.com/Index.aspx