The criteria which enable an applicant to transfer from one corps to another, or from An Fórsa Cosanta Áitiúil to An Slua Muirí, are as follows. The applicant must first apply for transfer to his-her commanding officer. The applicant must be recommended for transfer by his-her commanding officer. A vacancy must exist in the proposed corps-Slua Muirí. The applicant must satisfy the proposed corps-Slua Muirí that he/she is: qualified to fill such a vacancy; prepared to be reduced in rank, where necessary, to fill such an appointment for which he/she is qualified-in some cases this may be a reduction in rank to private or seaman rank; prepared to undergo such courses and training as to enable him-her to qualify for his-her new corps or an Slua Muirí and prepared, in the case of a transfer to Slua Muirí, to undergo vision and colour tests.