Ervin Samuel Brock, Jr. is my second cousin twice removed. He is also my Grand Uncle having married my Grand Aunt Martha Eliza Purvis.
As indicated on the below WWI draft card, Ervin was born March 6, 1880, the only child of Ervin Samuel Brock, Sr. and Harriett “Hennie” Boatwright.
The left card shows that Ervin was 38 years of age when he registered and at the bottom he signed his name with a mark indicating he was unable to write.
The other side shows that he was tall, slender built, gray eyes and dark hair and the card was dated 12 September 1918.
Ervin Samuel married Martha Eliza Purvis, daughter of William James Purvis and Mary Hulda Previtte about 1903. Their firstborn child – Mary Eliza Brock – was born on 12 June 1904 in Morven, Anson County, North Carolina. Great Uncle Ervin died in May 1954 and Great Aunt Martha died in December 1966.
To my knowledge Ervin Samuel, though registered for the draft, never served during the WW I conflict.
 "World War I Draft Registration Cards, 1917-1918," on-line digital images, Ancestry.com (http://www.ancestry.com : viewed 27 August 2012), Ervin Brock; citing Selective Service System. World War I Selective Service System Draft Registration Cards, 1917-1918. Washington, D.C.: National Archives and Records Administration. M1509, 4,582 rolls, FHL Roll Number: 1852503; Birth Date: 6 Mar 1880.as