The suspect is believed to be Robert Card, a 20-year US Army veteran from Bowdoin Center, Maine.
(according to Telegrams so take with grain of salt)
EDIT: Name confirmed by news.
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According to law enforcement, CARD recently reported mental health issues to include hearing voices and threats to shoot up the National Guard Base in Saco, ME.
Yea clearly sane enough to realize people at the base might shoot back so went with youth league night at a local bowling alley.
At least we can take solace in the fact absolutely nothing will be done about this and the exact same thing could happen again next week.