Details
Jay comments on Command in Chief going only to a natural born Citizen. Link to Library of Congress collection in box below.
Online Library of Liberty transcription (from Farrand):
New York 25 July 1787 Permit me to hint, whether it would not be wise & seasonable to provide a a strong check to the admission of Foreigners into the administration of our national Government; and to declare expresly that the Command in chief of the american army shall not be given to, nor devolve on, any but a natural born Citizen.
http://oll.libertyfund.org/titles/1787#Farrand_0544-03_194