Good website to research for Don't Ask Don't Tell?

I'm doing a speech on Don't Ask Don't Tell, and I'm in favor of repealing. I need good facts and statistics like 1. testimonies from people who have served in the military claiming it doesn't affect unit cohesion 2. how many crucial people we have lost because of the policy 3. any other good facts. If anyone could help me out by pointing me to a few good sites to gather this information, I'd really appreciate it.