It's the ultimate culinary war when the remaining 20 home cooks compete in the biggest field challenge in MASTERCHEF history: feeding an army of 500 servicemen and women on a desert army base. In their first team challenge, the contestants will split into two teams - the red team and the blue team - to create a hearty meal including one protein and two side dishes. Tempers flare as both teams struggle with consistency, and every dish counts as the troops will vote for their favorite dish and determine the winning team. Later, the losing team will face an intense pressure test featuring the all-American classic, blueberry pie. Find out whose dessert will prove to be a victory and who will be sent home.