Anyone ever experience an individual in their unit taking their own life?

Yes. My unit just experienced this a few months ago. A Soldier that had ETSd but had known most of the people in my unit, he had committed suicide. And when we were notified, it was a severe punch to the gut.

We had a soldier in my squad, SPC J, commit suicide after we re-deployed. It was awful. The entire company took an immediate gut punch and never really recovered. He knew how and when to boost moral. He was positive. He brought me out of my shell and showed me how fun it was to socialize and meet new people. He was the truest friend I've ever had. There were no signs. He frequently talked about reenlisting and talked to others about what they were doing when their contract was up. He was a true brother. The only regret I have is not paying more attention to any possible warning signs. I'll never forget him.

I lost my wife to suicide in October 1997. It was the darkest day in my life, and it still hurts over 22 years later.