An ancestor of mine, Peter Stormes, headed the U.S.  ship "Peacock" in Venezuela in 1823., am trying to find out more details about him.

Pre-WWI military service records are generally in the custody of the National Archives in Washington, D.C. For information on how to request the records, please visit: Requesting Copies of Older Military Service Records | National Archives. Hope this helps!

Dear Thais,

In addition to the military records that Megan Dwyre recommended, you might also find some useful information on the National Archives' website: Resources for Genealogists and Family Historians | National Archives.

Good luck with your search!