Section 7
SEC. 7. An officer placed on the retired list shall be withdrawn from command and from the active promotional list. When he is recalled to active duty, his name shall continue to be carried in the retired list and he shall thereafter be eligible for promotion in the retired list as long as he continues on such active duty and provided he is declared eligible for promotion in accordance with pertinent rules and regulations provided therefor: Provided, That such promotion shall be governed by seniority in the corresponding grade or rank, seniority to be determined by the length of active service rendered in each grade.