Complete 'All Ghillied Up' without alerting any enemies

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As this says, you must complete the level without alerting any enemies, on any difficulty. When you get to the first choice as you are standing next to the house, let him pass. At the second choice, when you have just taken out the patrol in the church tower, either option is fine. At the third choice, wait behind the bulldozer, and take out both enemies as they walk past you. From there, just be careful with the rest of the level, and you should be good to go.