Why not a wood chipper? Hear me out.

Lower operating costs. You can line them up and shoot the output at the line of those waiting to be woodchipped. If the attempt fails with a helicopter it would mean they survive with a few broken bones or perhaps nothing at all if they land in something like soft mud.. with a woodchipper failure means half chipped body hanging out in the feed chute... Might be alive might not. Woodchippers do not require a place to land/takeoff and can literally be deployed to every infected neighborhood in the country as needed. Could paint the opening of the woodchipper to look like GEOTUS's mouth.