(1)If at any trial for desertion or absence without leave, overstaying leave or not rejoining when warned for service, the person tried states in his defence any sufficient or reasonable excuse for his unauthorised absence, and refers in support thereof to any officer in the service of the Government, or if it appears that any such officer is likely to prove or disprove the said statement in the defence, the court shall address such officer and adjourn the proceedings until his reply is received.