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 passed the War Room on your way to see President Eden.