If the US surge in Afstan does go forward...

...it will triple the number of Army Brigade Combat Teams the Americans have there for actual combat (there are also the Marines and the Army battalion at Kandahar noted here). As best I can determine the US now has two infantry BCTs in-country, the 4th Brigade Combat Team, 101st Airborne Division and the 3rd Brigade Combat Team, 1st Infantry Division--both part of Combined Joint Task Force - 101 (more order of battle details on US and other forces in Afstan here and here). By the way, the 2-2 Battalion at Kandahar is organizationally part of the 3rd BCT just mentioned.

If, over the next several months, four more ground BCTs are sent to Afstan that will be a proportionately very large increase in combat capability indeed. Enough? Who knows? Certainly quite a national effort, what with Iraq and all.

The BCT concept is one thing Donald Rumsfeld seems to have got right:

...Rumsfeld did press for one of the most significant shifts in Army organization since the Napoleonic era, changing the Army’s central maneuver unit from the division to the brigade combat team. A brigade was only half or a third the size of a division (which could have anywhere from 10,000 to 15,000 soldiers). Its headquarters element was less bureaucratic and less top-heavy with colonels. The size of a brigade could be fitted to the situation. Rumsfeld’s emphasis on brigades represented an organizational means for dealing with a more anarchic, unconventional world. He planned to increase the number of Army brigades by a third, even as he reduced the overhead staff at the division level...

Update: But maybe the Marines will supply many of the reinforcements:

Marines drafting plan to send more troops to Afghanistan

Upperdate: Where some of the first additional BCT are planned to go:

U.S. to Boost Presence Near Kabul
Hundreds of Troops Destined for Afghan Provinces With Few Western Forces, Top Army Official Says