"Áo giao lĩnh" is a type of shirt that soldiers wear. It has a special design that helps them blend in with their surroundings and stay safe. The shirt is usually made from a fabric that is light and breathable, so the soldier can move around comfortably. It also has pockets so the soldier can carry important things like documents or tools. Overall, the "áo giao lĩnh" is an important piece of clothing to help soldiers do their jobs well and stay safe while they do it.