Maureen provided a basic introduction to Fold3, a subscription-based military website which is now owned by Ancestry. You can visit the site to learn which records are free (Maureen provided a list on her handout), or register for a free seven-day trial, or use it via Ancestry's Library edition at Vista Grande Library or gain access at the local Family History Center. Fold3 is also included in Ancestry's All Access subscription.
Service records, pension records, draft registrations and military cemeteries are some of the records included on the site. There are some non-military records, but most of them are accessible on other websites.
You can search the site by country, military conflict, branch of service, time period and/or name. You can also browse "publications," Fold3's term for their record collections. Searching is not necessarily intuitive, but be persistent.
Thanks, Maureen!