Jacob Keeter served in the American Revolution and was mentioned in a December 31, 1830, affidavit by Isaac Wickham and Nathan Pocknet. The affidavit was in support of the heirs of Mashpee veterans, Job Tobias, Jabez Jolly, Jacob Keeter, Isaac Swift, Simon Popmonet, and James Keeter in their efforts to obtain some pension or bounty funds from the United States government. All except James Keeter had died prior to the establishment of the Revolutionary War Pension Records and Bounty Land Warrants Act in 1818.
After his return from the war Jacob Keeter was a signatory, along with 31 others, on July 30, 1788 Mashpee petition highlighting the deficiencies in the recently passed Act limiting their autonomy. Revolutionary War Pensions, Massachusetts, Isaac Wickham, Fold3; Petition of the Mashpee Indians to the Massachusetts General Court, 1788.07.30.00