That concept isn't a very good one.
However, there is a way you could depict infantry kills in WinSP.
Handle it the way the Combat Mission Series does; for every infantry unit, e.g. squad, AT rifle section, killed, insert one body on the battlefield.
Does anyone remember Civil War Generals 2? They had dead bodies on the battlefield after a unit had taken some particularly heavy casualties:
Watermarked file I lifted from the CWG2 image directory