(3)
for development of his recognized potential for future career service.
However, the benefits of such a fellowship, scholarship, or grant may be accepted by the member in addition to his pay and allowances only to the extent that those benefits would be conferred upon him if the education or training contemplated by that fellowship, scholarship, or grant were provided at the expense of the United States. In addition, if such a benefit, in cash or in kind, is for travel, subsistence, or other expenses, an appropriate reduction shall be made from any payment that is made for the same purpose to the member by the United States incident to his acceptance of the fellowship, scholarship, or grant.