This part seems incorrect: > There are strict laws regulating police and poll workers while the polls are open. Police are not allowed within 100 feet of the polling location, unless they're actively voting or there on official business at the request of the election board. Additionally, anyone working at the polls in an official capacity is not allowed to wear any clothing with political messaging. One of the office…
"The American flag with the military oath of enlistment" is not "the American flag", but rather an attempt to make some kind of statement. At best it's political support of the military, at worst it's a possible dog whistle.
The US military is not a partisan tool nor a domestic political estate, so that message is not overtly supportive of one candidate or the other.