People are unpredictable, there's tons of statistics. Older men, those just discharged from an admission, those feeling better, usually men...they say those are who will be successful in attempts. If they have a history of attempts, something significant triggering them, life changing, anniversary deaths of people important. Those who have actual plans, then get drunk or high to give them courage.
Those who have been depressed & just tired of it all. Paranoid people, people who hate their hallucinations. People who have no support, there's so many symptoms. It can be anything.
For veterans, you have insurance & it's super good. You need to call the veterans association & find a therapist. If you're in Monterey County & have medi-cal, call the Crisis Team & get referrals for outpatient treatment. Actually, anyone in any county call your local crisis team (just Google, I have found resources in other states for patients). If you don't want to take meds? That's fine, you are in charge of your treatment, just reach out. If you see a loved one suffering, reach out for them. Just do something.