Yes; I do not believe I have combat-related PTSD. However I do believe that an early adulthood -- 18 to 31 -- spent in the Marine Corps does deeply ingrain certain modes of thought. When those modes are cemented by lengthy combat tours they can be hard to shake.

I think for me personally it is a highly anticipatory, self-protective mode. I am constantly assessing and "war gaming" where scenarios/situations might veer. This includes my daily commute, shopping trips and unfortunately romantic relationships.