The Jefferson Memorial and in parts of the Capital Wasteland.
http://fallout.wikia.com/wiki/Fallout_3_map
You can't get it, only Super Mutant Behemoths can use them and fire hydrants can't drop. The only the way to get it is downloading a mod from www.fallout3nexus.com for example
The super mutant behemoth
Yes, you have to kill people on Fallout 3 because they are trying to kill you. You also have to kill them to obtain their armor, weapons cache, food and other supplies. There are also super mutants, ghouls, radroaches, radscorpions, raiders, super mutant behemoths (5), Deathclaws, Mole Rats, Vicious Dogs and other things that also need to be killed in order for you to survive
There are 6 behemoths in Fallout 3
You are talking about the Super Mutant Behemoths. They just have a lot more radiation and it makes them bigger - like the HUGE roaches called rad roaches or (radiation) roaches. However, this was originally an concept from Fallout 1, where the FEV virus was let into the air by an accident by the US military following the apocalypse. The FEV virus was the original cause for all major mutations in the Fallout world and was so detailed that one can be forced into an super mutant state by dipping yourself in the vats of the Pure FEV (Pure Forced Evolotionary Viruis). Yet, if the original canon is valid in Fallout 3 is still to be told.
If you follow the main story of the game you should be sent to go into vault 87. In there you will meet a super mutant named Fawkes who will help you out. He will also be a companion if you have a good karma level
The second friendly Super Mutant is named Uncle Leo and he roams the capital wastes outcast by the Super Mutants because he did not think turning people into mutants was the coolest idea ever. He stayed more in touch with his human side after changing.
of course there in fallout 3
no. the bb gun will do little to no damage to the super mutant. what i did is i sold my bb gun to moira in megaton with the ammo and sold some other stuff an i got a pretty decent weapon
I have not used any mini-nukes in the entire game (except for the first Super Mutant Behemoth in the game) and I have 47.
I usually use my fat man to kill all the death claws especially in Old Olney. You could also get Fawkes the Super Mutant on your team which has a gatling laser and he is found in Vault 87.
Teenage Mutant Ninja Turtles - 1987 Super Rocksteady and Mighty Bebop 3-27 was released on: USA: 31 October 1989