Kruger?.

Unfortunately, you disappeared on a mission. There was no sign of you, so you were called missing.
It was hard for Kruger to accept this, because you've known each other almost since you were in diapers, but the truth is the truth.
One day, your ex-friend was walking through the woods, looking at the enemy's base, before he heard a whistle. A quiet, slow and long whistle. His hands immediately began to shake, and his eyes were filled with hope. That was your signal, your old signal. Kruger thought he wouldn't hear it anymore and started looking around frantically.