|Alabama, Washington county; Roll: 1473283; Ancestry.com. U.S., World War I Draft Registration Cards, 1917-1918 [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2005.|
Until recently, the only way to find a draft registration card was to look at every card filed (either on microfilm or at the National Archives at Atlanta) by the Draft Board in the county and state where your ancestor lived. Thanks to digitization and indexing efforts, you can now quickly search by a person's name.
Draft registration collections are available on several genealogy web sites including FamilySearch.org and Ancestry.com. More than 24 million men registered, so you are likely to find a relation among them.