For awhile, one son wanted to go into law enforcement, but then decided against it. I think there would be some similarities to a soldier serving overseas, except, that at some point, the soldier's duty time is up.
For a short time, while he was considering LE, I thought about it and my heart ached. But my spiritual beliefs held fast. Every person, I believe has a purpose in life, and when they recognize that, they choose whether to fulfill that purpose or not. Some people just know right off. Ultimately, God's will be done.
I pray that your son stays safe, but more so that he finds what he was meant to do. May he follow his "bliss." Life is for living. I am grateful for your son's service to our country.