Calvary
Cavalry.
You can remember because "calvaria" = a skull, esp. the top, and "cavallus" = horse (in Late Latin).
That said, women have no place in combat units. I'm a huntin' fishin' shootin' kind of gal, and I got a lot of muscular strength from my dad's line so I can generally do a man's work, even pushing 60. But I know I am not and was never suited for that sort of work. Inadequate upper body strength.