I have a labrador retriever?

he is about 1 year and 5 months old
sometimes he gets aggressive but thats only about night time when he hears somebody coming or anything else that disturbs the silence
but i wanna make him aggressive whenever i tell him to for example tell him "get him" and he starts growling because he is too much of a ***** sometimes
how do i make him aggressive on the command?
Answers:
lol u prolly can ha but just wanted 2 let ya kno that ur gettin best answer

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a dog... ruff ruff... used by po pos/piggs... ya heard!

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keep him close to you all the time.. that way you develop a certain connection that allows the dog to "think what you think" or sumthin like that... then train him to recognize good people and evil people.. the rest is up to your dog

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First off, it is not in the nature of a labrador retriever to become "aggressive" on command. You have purchased the wrong breed for this. They are known as a “sporting” breed and are trained to hunt and retrieve birds. They are also an excellent companion dog, highly regarded for its good nature and intelligence. Before you "destroy" this dog's nature, give him to someone else and get another breed (if you primarily want a Guard dog).
Editted: No, it is NOT wise to try to make a dog into something his breed was not designed for. To "force" him to become something he is not could actually destroy his good and kind nature. Now if what you want is to make him not aggressive, but rather protective that is something completely different.
And I know about this breed which is why I answered the question. I am sorry you do not like my answer, but I am being honest with you. A protective dog is not the same thing as an aggressive dog.
EDITTED ONCE AGAIN: You did not offend me, I understand that it can be hard to read "tones of voice" in dry type. I reworded my orginal post to make it clearer. Here is a website about the Labrador retrievers.
http://www.canadasguidetodogs.com/retrie...
You will note it says the breed is general non-aggressive and he is too much a people dog to be trained to be a guard dog. Most likely it would be difficult to teach him to growl or bark on command at someone.
If you are looking a breed for a good family guard dog, check into the Schnauzer.
http://www.yourdogs.info/dogs/standard_s...
This is a family dog that was actually bred and trained to be a Guard dog. They come in a variety of sizes and are wonderful companion dog.
If you want you could take the Lab to regular dog training classes at a local pet store. General training tips could be helpful in teaching him to behave appropriately. Also you could reward him with a treat if he behaves naturally in a way you want.
Hope this helps.

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I have trained all my large breed dogs in Personal Protection and Schutzhund and they were first well trained in obedience. My Lab and Dobe are the next 2 to go into PP training. The dog must be well obed. trained since if you can not abort his attack on a squirrel you won't be able to abort an attack on a person. In an interview(in prisons) muggers and robbers said the pass by houses with dogs and pass by people walking large well trained dogs since they do not know if the dog is trained to bite. Having a bite trained dog is a huge responsibility and not recommended if you have kids or frequent guests. Train your dog well in obed. and train him to bark/growl on command and more than likely that is all you need..esp if your Lab is black. Black dogs are much scarier to bad people.