Dear Ms. LaPorta,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located the Compiled Service Records of Soldiers Who Served in the American Army During the Revolutionary War in the War Department Collection of Revolutionary War Records (Record Group 93). While we were unable to locate any records under the name of Casparus Conyn, we did locate a record for Conyne, Casparus - New York - Van Rensselaer's Regiment. It is not uncommon for variant spellings for names to be found in the records from this time period. These records have been digitized and are available using the Catalog. Regrettably, they do not provide a rank.
These records were not created during the Revolutionary War, but were created by the Department of War starting in the 1890s from extant records among its files in an attempt to create substitutes for records destroyed by fires in 1800 and 1814. Because the Department was not able to reconstruct every record, a soldier may have fought in a Continental Army unit during the war, but there may not be a compiled military service record for him. For more information about these records, please email the National Archives at Washington, DC - Textual Reference (RDT1) 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 Compiled Service Records include a limited number of records relating to state military units, however most members of state militias are not referenced in the records. Additionally, state archives will sometimes have information about soldiers in these records that served in state units. We suggest that you contact the New York State Archives for further assistance.
We hope this is helpful. Best of luck with your research!
Thank you for the link. Is there any way to verify Conyn(e)'s rank of Captain since it's not indicated on this card?
Dear Ms. LaPorta,
Thank you for posting your follow-up request on History Hub!
The small print at the bottom of the second page indicates that the information on the card is derived from a record borrowed from the State of New York. If there are any additional records concerning this unit or New York militia officers that may be useful, they may be in the New York State Archives. Also, in some states, militia records from the 18th century are sometimes kept at the county level. We suggest contacting the New York State Archives for further information concerning state and local records.
We hope this is helpful.