SPD is the ticket, EC isn't close.
Example, and I really, really think you should read this. there is nothing else to do here, LOL

http://www.glassonweb.com/news/index/100...

"Research Frontiers Licensee GKN Aerospace Awarded U.S. Department Of Defense Contract For SPD-Smart Bullet Resistant Windows

September 7, 2009. Research Frontiers Inc. licensee GKN Aerospace announced on September 4, 2009 that it has been awarded a $425,000 development contract from the U.S. Department of Defense for SPD-SmartTM instantly dimmable bullet resistant windows.

GKN also announced that it will exhibit armored SPD-SmartGlassTM in London from September 8-11 at the Defence Systems and Equipment International (DSEI) trade show, and at the Association of the United States Army (AUSA) Annual Meeting & Exposition in Washington, D.C. from October 5-7.