Miss Launcher (Fallout 3)

The Miss Launcher can be found in Fort Independence. You can find the key on one of the outcasts or around in the lower level so you don't need to pick any locks or hack any computers.

Despite the name, and a research report implying it's targeting sytem dosn't work, this is simply a more powerful missile launcher found at 50% condition.

Bugs
If Charon is in your party upon entering the basement, he will automatically unlock the door to get to the enemies he detects.