Answer: The Order would be C, B , A below I explained
African American unit that protected bombers on missions and led mission is Italy-Tuskegee Airmen - a group of African American men who fought in World War 2
Native American radio operators who used their native language to communicate, making it impossible for enemy to intercept-Code Talkers-Navajo (native tribe) who spoke their private language to communicate and spy on the enemy.
All-nisei soldiers and the most decorated in U.S. military history-Go for Broke Regiment- a group of Japanese (nisei) men who fought in World War 2
I hope this helped and Good Luck <3 !!!