May an Active Duty service member sign out on leave, sign up (register) for Space-A and if there is a wait for the flight, go back to work to avoid loss of leave time?

When registering for Space-A travel, either by fax, mail/courier or in person, the member must have an approved leave or pass authorization effective on or before the date of registration for Space-A travel. You must show your approved leave with an effective date on or before your sign-up date. If a member registers for Space-A travel but voluntarily returns to work during the intervening days before the actual flight departure, leave will be charged for those days. You must be on leave throughout your entire Space-A leave travel period.