Yikes is all I can say. That doesnt sound like fun at all. The irony is that besides training and being fit. And you doing Special Forces I have to assume you are super fit. What what I have read / learned and experianced. The trick to breath holding is totally depended on your frame of mind.
Holding your breath is mostly a mental game and being totally relaxed. Something im sure your instructors dont let you get much off. Man you have my sympathy ... if that helps
Ok im just joking with you someone will give you some real advise soon
