>Author here. The military is a political entity, and different voters have different opinions on.

The USA is a political entity that different voters have different opinions on. The city, state, school district, utility district, sanitst district, etc. are all political entities that different voters have different opinions on.

The specific guidelines you linked on electioneering do not ban flag t-shirts, or anything military related (the military is not a candidate, campaign, or political party, and is strictly apolitical).

It's unconscionable that election officials are publicly admitting to breaking election code in 2020.