While military histories often focus on male combatants, millions of women served in armed forces, resistance movements, and combat units during World War II. From Soviet sniper regiments and British SOE agents to Polish Home Army fighters and American ferry pilots, women operated machine guns, flew bombers, conducted sabotage, gathered intelligence, and led partisan units across every theater of war. This book examines the diverse military roles women assumed during WWII, drawing on declassified documents, personal testimonies, and archival photographs. It explores how different nations mobilized female personnel—some into direct combat, others into auxiliary services—and traces the institutional barriers, cultural resistance, and propaganda campaigns surrounding women's military participation. Through firsthand accounts and documentary evidence, the narrative reveals how female soldiers navigated gendered expectations while performing the same dangerous work as their male counterparts. The book also addresses the postwar erasure of women's contributions from official military histories and examines how Cold War politics shaped collective memory of female combatants. Readers will encounter Soviet Night Witches conducting bombing raids, French Resistance couriers transporting weapons, Yugoslav partisans commanding brigades, and WASP pilots ferrying fighters across the Atlantic. The book provides historical context for each nation's approach to female military service while highlighting the universal challenges women faced in proving their competence under fire.