Afghanistan or Iraq? (Sherlock)

When John Watson's therapist recommends him to go to group therapy to help him with his PTSD, John doesn't want to. This changes, however, when he sees the dashing Sherlock Holmes.

Type: Group therapy AU
Characters: John Watson, Sherlock Holmes, Greg Lestrade, Jim Moriarty, Philip Anderson, and Mary Morstan (mentioned)
Pairings: Johnlock
Warnings: mentions sociopathism, psychopathism, PTSD, war, and therapy. Does not go into details for any except therapy