This is a prequel to Talking in Code, a book with a m/m/m polyrelationship between three soldiers. According to the blurb, Talking in Code also heavily deals with PTSD.

"Revelations" is a series of short stories from the POV of the three men, describing how the relationship between the three of them started. Tim and Richard have been together for 20 years when they decide to include a third person in their relationship, 24-year-old Eric.

I love polyrelationships, I loved that it was an established older couple accepting a younger man as their third, and 90% due to Mass Effect, I also have a fondness for millitary settings. So by all means, I should have adored this, but I just... didn't. The writing wasn't really working for me and I found much of the dialogue cringy.

I'm considering picking up the full book (Talking in Code), but I'm not sure I'm ready to deal with the heavy themes the blurb describes.