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For an overview of missile launcher types in the Fallout universe, see missile launcher.
Annabelle is a unique missile launcher which appears to have a long history of service. Drawings on the front show a maple leaf with four markings and the stars from the Chinese flag, indicating that the weapon was used during the annexation of Canada and in at least one military campaign in China. The drawing on the back of the launcher reads "Annabelle".
Annabelle has a built-in guidance system to improve accuracy, and uses less AP in V.A.T.S. than the standard weapon. It is also lighter and has a lower Strength requirement. With no disadvantages, this is a great alternative to use over the standard missile launcher.
pcxbox360ps3 If you kill the nightkin sniper and don't get this weapon from him it will not be there if you come back at a later date. This includes entering one of the nearby buildings, loading a save or leaving the area. The body of the nightkin sniper somehow falls through the catwalk, and appears under the radio tower. [verified]
xbox360ps3 Sometimes it will fire a second time without reloading. This will continue until you bring up your Pip-Boy, switch weapons, and then exit out of the Pip-Boy. [verified]
ps3 Occasionally, for some unknown reason, it will appear in Torres' inventory in full condition. [verified]
pc Sometimes, when left in a follower's inventory for too long, it will disappear and can never be reacquired. [verified]