Mobile, Mobile, Alabama, USAMobile National Cemetery. I don't know if this is the correct John McChesney but MFRNY has he died at Fort Jackson and there was a fort in AL and then this gravesite has John died and buried 18 Sep 1816.
References
↑National Cemetery Administration. U.S. Veterans Gravesites, ca.1775-2006. (Name: Online publication - Provo, UT, USA: Ancestry.com Operations Inc, 2006.Original data - National Cemetery Administration. Nationwide Gravesite Locator.Original data: National Cemetery Administration. Nationwide Gravesite Locator;).