Claims of employees of the United States who are neither citizens
nor residents of the United States, any territory or Canada, if
otherwise compensable, shall be approved only upon evidence of the
following nature without regard to the date of injury or death for which
claim is made:
(a) Appropriate certification by the Federal employing
establishment; or
(b) An armed service's casualty or medical record; or
(c) Verification of the employment and casualty by military
personnel; or
(d) Recommendation of an armed service's ``Claim Service'' based on
investigations conducted by it.