You see a squadron of military jets flying overhead. what kind of good is this

Public Good

Explanation:

The Military spending is not seen as public good, but Defense is.

In economics, it is considered that a public good something that's non-rivalrous and also excludable in a way that individuals may not be excluded from using or enjoying the goods without having to pay for it. In the US, both the air that you breath and public defense are considered public goods.

imperial crisis leads to civil war.

roman forces withdraw from britain as goths attack rome.

odoacer topples romulus augustus

huns attack the empire and drive german peoples ahead of them.