Regarding a "Chinook" in A3. Ask and ye (apparently) shall receive!
As posted by a user on the BI thread:
http://forums.bistudio.com/showthread.php?178666-Arma-3-Helicopters-DLC-Discussion-(dev-branch)/page25
In the future, even our coffee makers will feature stealth technology...
In all seriousness though, it looks a little too "GI JOE" for me, but they've just made Rotorlib available for mods, (dev branch only still), which should see lots more stuff coming down the pipe.