Pocket Modern Warfare is a free print and play simple table top game using top down paper minis from Junior General website that can be played virtually anywhere. Using the top down paper vehicles and soldiers from Junior General one can use the terrain available from the site or use any other manner of item to represent buildings and terrain on the table top.
The play is also simplified in easy rulers that are printed with the game that take care of movement and firing ranges. So no tape measures to carry around, just some dice and all the paper mini's you've printed.
For more free great minis visit:
http://www.juniorgeneral.org/