Footnote dot com is another VERY useful subscription site with LOTS of images of historical documents including from the U.S. National Archives and Records Administration, who they work with.

ancestry dot com won't allow links to their site however.

Terry found several relevant docs there, including a set of 2 military service cards for

William Thrift, Lieut. Col. Lytle's Command, (Caswell Co.) NC. Card numbers 37450663.
Wm. Thrift appears on a list of men Inroled for Capt. Robt. Moore from Caswell County (revolutionary war).
List dated: not dated.

Who is this William Thrift, apparently born before ~1760?

Richard Thrift

The John Thrift born Petersburg, VA 1760 per his revolutionary application for pension, Elizabeth, his wife, in her application states they lived in Caswell County also.
terry