Re-entry into army service14
A person serving in the reserve by virtue of these Regulations or any previous enactment or by virtue of having enlisted for a term partly of army service and partly of service in the reserve, whose application in that behalf made by him in writing to the competent military authority has been approved by that authority may at any time re-enter army service and according as may be specified in that application—
a
be treated for the purposes of these Regulations and Part 1 of the 1955 Act5 as if he had not been serving in the reserve and as if his army service had continued while he was serving in the reserve;
b
serve in army service for the remainder of the period for which he would have been liable to serve in the reserve if he had not re-entered on army service; or
c
serve in army service for a specified part of that remainder and thereafter serve in the reserve for the residue thereof.