Helicopters were introduced along with the Steampunk Heroes. The update also included a pocket version of the helicopters, which costs 599 for one day's use and 4999 for permanant usage. It is an unlimited use widget with a 1 minute 30 second cool down between uses.
Prior to it's release, a teaser was published on Battlefield Heroes Youtube channel.
The helicopters also appeared on the background giants.
The National helicopter is based on the Flettner Fl 282.
The Royal helicopter is based on the Sikorsky R-4.
The Helicopters were ideas created in the WWII items contest, the FI 282 and the R-4's original idea and concept artwork was done by player Czruno.
Due to a glitch at time of posting, the helicopters will occassionally give out Road Kills and Tank Smashes after machine gun kills which do not involve any physical contact between the helicopter and the player.
Much more like Boat, Helicopters have not any Heroic Moments assigned to it (except if you count wingman) , nor can do any except bug above.