Here's an example. The mission needs 12 SWAT total, with 3 additional needed with only 6 "real" ones on site. The extra 3 that count appear to be from the helicopter.
Police Aviation trained personnel in helicopters appear to count as SWAT after update, at least it does for Large Grow Operations and VIP Appearances. I'm unable to upload a picture, but should be easily replicate for devs.