I'm no expert but I think that retro looking helicopter with the large red crosses on white background, on both sides of the dark green 'copter is a US Army Reserve blackhawk from Grenier Field in Manchester. It has a loud exhaust.
Just noticed the
www.unionleader.com has a story on the small civilian helicopter that fell into the lake.
Sometime in the middle of the afternoon, like maybe at three, the large red & white Meredith fire boat cruised around the south end of Bear Isl, heading north towards Y-Landing, with maybe 3-4 aboard. You almost never see that boat out & about. It is identified with a dark, fire engine red hull, white upper enclosed cabin, and two Suzuki four-stroke outboards.