This is a story about the brave Army and Navy nurses who served in the Pacific in WWII, and those who were taken prisoner in the fall of Bataan and Corregidor. I used to know one of those Navy nurses who served in the Pacific, and you can't say enough about their bravery and dedication to the men who were wounded in battle. They did whatever they could to comfort those soldiers.
As for the story line, there were 77 nurses who were evacuated from Bataan to Corregidor, and subsequently taken prisoner and moved to Santo Tomas internment camp, where they worked in the hospital there. All survived the war. In interviews, they stated they suffered from malnutrition during imprisonment, and were not raped.
The story line says four nurses participated in the Bataan Death March. I cannot find any historical evidence of that. All were evacuated to Corregidor before subsequently taken prisoner when Corregidor fell.
There is a reference to General MacArthur ordering planes to be grounded while the Japanese bombed the airfields in the Philippines, and eliminated the Army Air Force in the Pacific. This was controversial. MacArthur said he was acting as the Commanding General of the Philippine Army, which had not yet declared war on the Japanese. He was also Commander of US Forces, and did not act on their behalf. His reasoning is still shrouded in mystery. He was also criticized by some in the film for deserting his army in Corregidor and escaping to Australia, but that was more justified to avoid capture of an important leader.