(a) There may be furnished to a person attending a school or camp established under section 4411 of this title, for travel to and from that school or camp

(b) The travel allowance for the return trip may be paid in advance.

(c) For the purposes of this section, distance is computed by the shortest usually traveled route, within such territorial limits as the Secretary of the Army may prescribe, from the authorized starting point to the school or camp and return.