Requirements:
-Server min. size: 8vs8
-Voice comm

When playing this doctrine you want to make shure that:
-You do have a advanced armory 2 minutes before the second hive is up.
-You do have saved about 120 res 2 minutes before the second hive is up.

How do we achieve these 2 goals?
-There are no weapons handed out before the AA is up.
-Marines should only be given the ammount of ammo/meds they need.
-Desired upgrades are au1 and wu2
-The armory should be protected with a single pack of mines
-Dont try to lock a SINGLE hive location
-Electrify is not an option
-Turrets are not an option
-You are comm and base guard.
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A build order based on this doctrine looks like this:
-IP
-Armory
-Arms Lab
-AU1
-WU1
-Mines for Armroy
-Advanced Armory
-IP
-WU2
-Obs
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Once your obs is build make shure that you scan the hive locations regularly.
If you have found an unbuild hive it is time to perform the sledgehammer:
Beacon and hand out 2-3 HMGs 3-4 SGs and maybe 1 GL, as well as 3-4 welders. Let your marines hump the armory and send them to a hive. If you have 20 res to spare research catpacks.
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The only open question is:
-Which hive to attack?
--This depends on several factors:
---What chambers do the aliens have?
---Where are those chambers located?
---How many and what lifeforms do the aliens have?

Some small examples:
The unbuild hive is heavily infested with OCs ->attack the first hive
EC is main and there are 2 sens in the vents near CC ->attack EC
Aliens have MC, but no MC at their unbuild hive ->attack main hive
Aliens have MC and 2-3 Fades ->attack unbuild hive

There are much more scenarios and combinations of them are also quite possible.
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Assuming that you have succesfully taken down one of the hives the aliens are having a huge disadvantage and the rest of the game should be like a tea party.

If you did not succeed in taking down one hive and were not able to take down several higher lifeforms during trying so. It is usually GG.
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To sum it up: If you try a sledgehammer it is always a turning point in the game.
In other words: It is a do or die in most cases. Take down the hive with a single massive assault or die trying so.

post scriptum:
If you write something like "OMG your tactic sucks, like the big one" i am going to slap you in the face. It is "OMG your doctrine sucks, like the big one"

"trust me, i know what i'm doing."

As i said: It is a doctrine and the build order fullfills the need of this doctrine under special circumstances. I do not follow this path everytime. It was just an example of a build order that worked pretty often.

NS is no pure RTS, you cannot have a fix build order. In Starcraft all Marines perform the same as well as all Hydralisks.
Things in NS are different because of the human aspect of your units and thus using a fix build order will lead to frustration and losses quite often.

I do a similar strat, but I dont waste money upgrading the Armory.
HMGs suck for taking down hives, and early in the game a shotgun should be just as usefull in the hands of your marines for taking out those fades (HMG should only be used to stop onos's, or to guard long coridors. This strat is to early for onos, and hives arent in coridors.)

Shotguns > Hives. I Get an arms lab right off the bat, climb right up to weap 2 or 3 depending on time, get cats, and rush a hive.
It takes less then 10 seconds to liquidate a hive with 6 shotguns I believe.
With catpacks, and your 8 marines on the field, the hive will be gone in less then 5.

So you explained us shotgun rush with hamgees including?

I would go as far to say that armor2 is > then weapons 2 just because you get another hit added to your life.

True, your build is much less of a suicidal rush than mine, since I skip on crucial upgrades like PGs and Advanced Armory to conserve res for the rush. I will easily admit you have a much better chance of coming back from a failed sledgehammer than me.

But I still think I have a better chance of pulling off the hit.

One thing I would like to see is the sledgehammer that does not blow oyur whole economy away. Is there any way to make it safe for economy, it`s kinda hrad due the basic idea is that you hoe res till you can afford all with guns and other compulsory stuff like bacon and that pg under hive.

keep one person out of the rush to protect/cap res

I tend to set a phase up for a ninja, get everyone to go through, shot up the hive, then phase back and recycle the phase.

By the time the aliens reach the hive theres no site of a marine anywhere. The phase gate isnt glowing or making noise either because it's recycling.

Its a good scare tactic that makes the aliens all think your hacking

Before using a big word like "doctrine" you should explain it to the forum readers and how you think this word applies to NS. Here's a link that explain what military doctrine is, http://encyclopedia.lockergnome.com/s/b/Military_doctrine, but i don't think it applies well in NS. Natural selection is much more fast-paced than wars and I don't think there is time to establish a doctrine. Within a match your proposal would be a plan of action rather than a belief. A clan may set up a doctrine to follow throughout their matches, but it is impossible to set a new doctrine every new match (especially in pub games).
Please explain what you mean by doctrine within NS and how it is different from a tactic and please provide examples of other already established doctrines within NS to compare it with -- It seems like what you call "doctrine" is usually called "tactic" within the NS community.

Back to your proposal -- One weakness of this plan is that the marine base is wide open so a fade or even a skulk could eat up the armslab and AA while your teammates attack the hive. Also, it requires a team that works well together so they will all move toward the hive together, cover each other, and weld each other - it's a big requirement. Furthermore, if aliens work together and spot the marching marines, a lerk can slow down the marine's progress giving the other aliens enough time to respond and/or attack the marine base.
These are just a couple of problems I can see. Overall, though, this is a great tactic making use of the several most neglected marine tools: welders, scan, and combined arms.

[EDIT] What Faskalia describes looks more like a tactic than a doctrine.