1940: Gale Allen of the Women's Space Battalion. Written by Fred Nelson (house name?). Introduced in Planet Comics #4, April 1940Planet Comics #4, April 1940, p. 55. We learn her rank in Planet Comics #5, May 1940Planet Comics #5, May 1940, first panel on p. 15, when a subordinate addresses her as "Captain Allen":
BEG PARDON, CAPTAIN ALLEN. MIDWAY FLOAT BEING ATTACKED—YOU ARE TO PROCEED THERE AT ONCE!
