The expected Battlefield Vietnam patch has been released.

You can read all about it in this weeks community update.

Here's a snippet of the readme...

NEW CONTENT AND FEATURES
**Maps and Vehicles**
Defense of Con Thien is a head to head battle across the DMZ separating North and South Vietnam. Defense of Con Thien features 3 new vehicles:

* OH-6 Loach is a scout helicopter used by the USMarines. It's fast and agile, armed with chain guns and can be used to spot for artillery strikes.
* Ka-25 'Hormone' is an attack helicopter used by the NVA. It carries chain guns and heat seeking missiles, and also benefits from the addition of radar in the nose.
* Stationary M60 emplacements with infinite ammo.

There are lots of other additions and bug fixes, the 130mb update file is available at the following fine hosting locations.

http://www.fileshack.com/file.x?fid=4991
http://www.eagames.com/official/battlefield/vietnam/us/editorial.jsp?src=demo_editorial