(a)If a government servant is transferred to foreign service, the head of the office or department should send his service book to the Accountant General who will return it after noting therein, under his signature, the orders sanctioning the transfer, the effect of the transfer in regard to leave admissible during foreign service, and any other particulars which the Accountant General may consider to be necessary in connexion with the transfer. On the government servant's reversion to government service, his service book should again be sent to the Accountant General, who will then note therein, under his signature, all necessary particulars connected with the government servants' foreign service including the fact of recovery of leave and pension contributions.