Operation Steel Wind is the Belgian Embassy operation in London. Choose a four man team. You should be able to complete all the recruit-level missions with a four man team. If not, you need more practice. With weapons fine-tuned and team chosen its time to choose kit.
Hostages are white dots.
Once you initialize, run with your team to the right side-door. The trick to entering the embassy is to do it when the minimum of tangos are patrolling immediately inside. Use of your map to spot patrolling bandits will get you through this. You need not kill all other tangos to achieve success, but it can be more fun. Learn to get to the mission objective and get out fast.