Bobblehead - Energy Weapons

 is a Fallout 3 item, a Vault Boy Bobblehead. It permanently improves your character's Energy Weapons skill by 10, to a maximum of 100.

Location
Found in Raven Rock on the right desk in Colonel Autumn's bedroom. After you pass the huge door from section 2B to 2C, when two Enclave soldiers come out of the right door, take the left one. Be sure to grab this before you leave the Enclave base, as you cannot return for it. Neither can you acquire it if you have entered the War Room on your way to see President Eden.

The Bobblehead seems to be carrying a weapon similar to the Alien blaster.

Console
If you missed the Bobblehead and play on PC, you can either use the console to spawn the Bobblehead next to you or go back to Raven Rock by using the  command.

Video
Obtaining Bobblehead Energy Weapons RNfKRka_Uug