Dear Ms. Powell,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the Indexes to the Carded Records of Soldiers Who Served in Volunteer Organizations During the War of 1812, the Carded Records Showing Military Service of Soldiers Who Fought in Volunteer Organizations During the War of 1812, and the Muster Rolls of Volunteer Organizations During the War of 1812 in the Records of the Adjutant General’s Office, 1762-1917 (Record Group 94) that may include information about John McCaw’s military service. We also located the Index to War of 1812 Pension Application Files and the War of 1812 Pension and Bounty Land Warrant Application Files in the Records of the Department of Veterans Affairs, 1773 - 2007 (Record Group 15) that may contain information about John McCaw. Some of the files have been digitized and available via the Catalog. For access to the non-digitized records, please contact the National Archives at Washington, DC - Textual Reference (RDT1) via email at firstname.lastname@example.org.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT1. We apologize for this inconvenience and appreciate your understanding and patience.
The indexes and the pension files also are available online via Fold3. There may be a fee for using Fold3. Instead, please check for access at your local library as many library systems subscribe to these sites, making them free for their patrons.
In addition, we suggest that you contact the Indiana Archives & Records Administration to request a record search for John and Mary Walden McCaw plus review the FamilySearch Research wiki for Vigo County, Indiana Genealogy and Indiana Vital Records - Substitute Records.
We hope this is helpful. Best of luck with your family research!