Vault-Tec - Noble Heroes or treacherous villains? *Major League Spoilers*

Actually this is all covered in the previous games. The FEV is from the first one, the Vaults on the West coast at least were designed to see the effects of many factors of long term space travel on the people inside. the original plan was to take the residents of Vault 13 out and with the Enclave search the stars for a new planet. The reason they did this was because 2 alien space crafts discovered crashed. The ones in the capital wasteland it seems were designed to test the ability to create a massive Clone super army, that was uninhibited by morals and cloned from the best of the best, as demonstrated by all vaults except 101. A few of the vaults were redundant with one or two being dedicated to different forms of control. But really all the vaults purposes can be found here

Vault-Tec actually expiremented on vault 87 residents?I thought the vaults were supposed to be used for one purpose.Preserving humanity,not dunking residents in FEV or putting a drug in the air system or cloning a guy named Gary.So basically vault 101 was the real LIVING IN vault right?

Vault-Tec actually intended for the vaults to save humanity. The enclave, the shadow government back then, decided to conduct these tests. From what I've read on the wiki

Vault-Tec is just a company, they were doing their job by building the vaults for money. The malfunctioning doors on some and odd filtration systems were built for experiments, but vault-tec just went a long with it.

lets see...

vault 77- one guy and a box full of puppets its *bleep*ing hilarious

vault 108- to try to duplicate living things via cloning

vault 99- to test a special "white noise" drug it was intended if I remember correctly to turn the people into super soldiers... needless to say it didn't work

yes actually thanks for pointing that out it is in fact vault 92