Vietnam Airsoft resources/gear...
Gear:http://www.combatsportsupply.com (good selection of US and VC/NVA gear for starters/cheap)
http://www.fullmetaljacket.com (another good site for US and VC/NVA gear for starters/cheap)
http://www.goestores.com/home.aspx?Merc ... tcompanyn2 (good site for NVA/VC gear, uniforms)
http://www.mooremilitaria.com (THE definitive VN gear site, used by re-enactors and VN airsofters alike...have the real deal suplus VN era stuff as well as repro stuff, top quality)
Reference on gear, uniforms, etc... (get it right as best you can to honor those that served if you are going to do a period/era event or loadout):http://www.mooremilitaria.com (have a reference section as well)
Vietnam Airsoft website, which has TONS of info and all you need to get in and do it right:
http://www.vietnam-airsoft.com/phpBB3/Lastly, Ebay, if you use it, is a great resource for period/era VN gear as well...just do a search for "Vietnam Militaria" and you should come up with tons of stuff. Deals are there for those who know what they are looking for and looking at.
Just a few to get your started, there's much more out there. Good luck and enjoy!