You Gotta Shoot 'Em in the Head

 is a Fallout 3 quest. It is also an Xbox 360 and PC achievement.

Awhile ago, Allistar Tenpenny hired five mercenaries, Crowley, Tera, Dave, Strayer(Who has since died) and Dukov. They were hired to find a rare gun for Tenpenny. Tera died in the fort and Crowley supposedly bit the dust. After feral ghouls got Tera, Dukov realized he would get more of the commission. So he later locked up Crowley in a room with feral ghouls, which never harmed him. The three remaining men finished the mission with Dave and Strayer being very leery and cautious.

Objectives and walkthrough
Mister Crowley, a resident of Underworld tasks you with finding and killing Dave from the Republic of Dave, Ted Strayer, Dukov, and Allistair Tenpenny. He asks you to do this because they are Ghoul bigots. If you manage to successfully persuade Ahzrukhal, you can find out through a short chat with Mister Crowley that what he really wants is the keys each person has. instead of 100 caps for each headshot, he will give you 100 caps for each key you bring him, also with an added bonus. However, he still wants you to kill Allistair Tenpenny.

Getting the Keys
You can pay, persuade or kill Dukov for his key or persuade Cherry, one of Dukov's "party girls" to retrieve the key for you. You can also just pickpocket it. Or if are a girl, you can talk Dukov out of his key without paying for it with the Black Widow perk.

Strayer's son is now in possession of his father's key, which you can either persuade him to give it to you, threaten him, pay him, kill him, or pickpocket it. If your strength is high enough to threaten him, he will give you everything in his inventory including his clothing. If you kill him, the guards will attack you.

To get Dave's key you can kill him, steal it or persuade him, just don't mention Crowley would like for you to kill him. Go with the Wasteland Ambassador Route, which needs very little speech skill, to get the key. If you do mention Crowley would like you to kill him, you can still gain the key with multiple speech successes.

Choices
Now you have a few Choices, you can use the keys to go to Fort Constantine to get the T-51b Power Armor or return the keys to Crowley. Returning the keys or collecting the power armor both count as a successful conclusion to the quest. Of course if Crowley already has the keys or you just gave him the keys you can steal them back or kill him for them.

However, if you're going to kill Crowley anyway, before you do that you might as well warn Tenpenny Crowley wants him dead. Tenpenny will offer you 200 caps (300 caps with speech) to kill Crowley instead.

Once you have collected the T-51b Power Armor for yourself, the quest will have been counted as completed and Crowley will no longer be waiting for you back at the Underworld.

(NOTE: This is a glitch associated with this quest. Please see the talk page for more.)

Getting the T-51b Power Armor
First off you have to reach the fort, in the North West part of the map, near Raven Rock. If you travel from Raven Rock, be prepared to fight Enclave troops, Yao Guai and some treacherous terrain. Closer to the fort you encounter some Brotherhood of Steel Outcasts fighting Protectrons and Mister Gutsys. Go to the small house "the CO's house" and head downstairs. In the basement you will find caps and a Bobble head go to the door, which will require strayer's key. Continue down picking up ammo and other supplies along the way. Eventually you will reach an ICBM launch computer, you will need to launch it to open the door down the stairs. In bomb storage you'll find Tara's body, on the opposite of the two very hard locked doors. Go to the nearby door open it with your key and pick up the fatman inside. Now disable the stasis field and you have your armor.

(NOTE: There is also a safe inside the first level of the basement complex that contains an ICBM launch code. Look around a level or so below that and you'll find the launch control terminal at which you are given the option to launch an ICBM.)

Also, if you give Mister Crowley all 3 of the keys, he will run to Fort Constantine. Later he will return with all 3 keys and the T-51b Power Armor, along with some other odds and ends. This makes it so you don't even have to travel to Fort Constantine if you don't want to. So if you happen to have the Sandman perk you can kill him without attracting any attention from the rest of Underworld. Now you have your armor and the keys!

killed him, no one else alarmed!! memo
 * NOTE: i don't have the sandman perk.I tried to picpocket the armor..obviously he noticed.. then i ran out,my NPC FAWKES