A "proper use" of military weapons, Foolestroupe, is the use of them to resist any foreign aggressor who is deliberately attacking, invading, and/or occupying one's own homeland (or ships, etc).

Such genuine self-defence is the natural right of any nation or community, and that has been understood ever since the most primitive days of human development. Animals who are territorial also understand the concept quite well.

An improper use of military weapons is to use them in a first strike of one's own free choosing on someone who has NOT attacked one's homeland (or ships, etc).

Aggression is improper. Self-defence is proper.

Supposed self-defence that is totally out of proportion to a perceived "attack" is also improper...for example...the USA has spuriously used certain marine incidents (whether real or concocted) to justify launching wars in the past (like against Spain or in Vietnam). Those were not cases of legitimate self-defence, they were case of finding an insincere and flimsy excuse to do what you wanted to do in the first place anyway. That's really aggression masquerading as self-defence.

The Germans also did that sort of thing in regards to Poland in '39. They claimed that the Poles had attacked them first (with a border raid), which was an outright lie. The Germans themselves fabricated the border raid, using prisoners in Polish uniforms whom they shot dead.