Check out http://www.slick-net.com
Excellent , if grainy, vietnam ere photos of USN heli ops click on the icon to the right of the campain ribbon. Some interesting and strange links on the R+R page.
Also http://www.grunt.com has some interesting USMC stuff and links.
I have much to much time on my hands on this desert Island somewhere in the Persian gulf.
Interesting that they have models for sale in the stores here but no glue or paint!
Cheers