Several of Heinlein's heroines had both red hair and technical acumen, a shout-out to his third wife, who was an organic chemist and engineer. Name this woman, who achieved a higher rank in the Navy than Heinlein did, and who was noted for her participation in Usenet fan groups late in her life (first name, nickname, or maiden surname required).
Virginia "Ginny" Heinlein (nee Gerstenfeld)