Look at model railroad figures for pedestrians, regular police officers, construction workers, etc. The O scale figures might be a bit small for use with 28mm minis, but you can justify the size difference by the fact that the PC's minis should look larger and more 'heroic'.
Or you can use HO scale model railroad figures with HO (1/72 scale) plastic soldiers (from Airfix, etc). The good thing about these are that you can use many of the HO-1/72 scale military vehicle kits as well as model railroad scenery. The downside is that there aren't as many HO scale modern military figures as there are in 28mm.
Or you can use HO scale model railroad figures with HO (1/72 scale) plastic soldiers (from Airfix, etc). The good thing about these are that you can use many of the HO-1/72 scale military vehicle kits as well as model railroad scenery. The downside is that there aren't as many HO scale modern military figures as there are in 28mm.