If by "Bergen unit" you mean a company of Bergen County militia, then "served in" is something of a misstatement.
All able-bodied free white males aged roughly 16 to 60 (varies by time and place) were considered to be part of the County militia and required to be available for active militia duty for defense within the County. Active duty could include such things as patrolling, guarding prisoners, or assisting escort of supplies bound elsewhere.
Surviving militia rosters were usually created at the time men reported for regular drill and nose-counting, and do not reflect active-duty service unless specifically stated.
If you can show that your ancestor was the only one by the name who could have been in a specific Company, that would be a step forward. Companies were generally based in specific geographic areas; you would need to find the county Court or Committee of correspondence record setting out the districts and show that your ancestor was the only one by the name who lived in a particular one. It would help to show that his neighbors as shown in land records, tax lists or other records were in the same Company. You would need to locate rosters of this Company. While Mr. Stryker is a respected author, you'd need the original records.