The CH-47 makes three appearances in the campaign. In U.S.D.D. as the helicopter which transport Alex Mason to the Pentagon, in S.O.G. as a few of the helicopters taking off and flying in the beginning and in Redemption where several of them are seen flying above the US Navy ships.
Oddly, the picture of the CH-47 in the killstreak menu details the helicopter with see-through windows and even a partly visible crew. When viewing the helicopter in game, one will notice the windows of the helicopter are completely shaded and dark.
In Theater Mode, the Chinook is poorly detailed, and only has a rear loading ramp.
The Chinook and the Cobra are the only helicopters in Black Ops which are not shot down in the Campaign.
Notice in the video below that a part of the explosion features a tail rotor, which a Chinook does not have.
Chinooks are the only helicopters that can come when other helicopters are present.
After dropping a reward crate, it can move fast enough to avoid a locked-on rocket.
Shooting at enemy Chinooks is a great way to unlock Hardened Pro, as the helicopters are a large target and are stationary when dropping the crate.
In multiplayer, it is the only helicopter not to have flares.