As I think about it, Fascism is nothing but the application of the military model to society. Everyone is assigned a place, and it is expected that there be no friction and no competition between the parts. A Command economy is one based upon Generals who know what is best for all of us. They decree it, and it happens (even if a few lose fingers and toes in the machinery).
That this mindset would lead naturally to aggressive militarism seems obvious. You have everybody forcibly confined to little boxes, many of which are not suitable for them. This breeds anger, and you then need some sort of outlet for that. Go invade someone. Simple enough plan.
And as I have said often, Communism is just Fascism confined to a border. The aggressive militarism is directed at the population itself. Cuba has in fact more or less invaded other countries, but for some years now it has existed as a figurative as well as literal island. The secret police are everywhere, ready for action; but the people have learned to suffer in silence. What is left for them is decline: all the energy is gone.
Edit: I will add that we might usefully define Communism as “Fascism without hope”. Mussollini and Hitler found outlets for the aggressive energies of their nations. Even if you didn’t like your station in the order, you had the opportunity to go take other people’s stuff. In this respect, Napoleon–whose soldiers were in large measure always paid in booty, and the opportunity rape other men’s wives, mothers, and daughters–was clearly a Fascist. He kept the French busy for quite some time, while Emperor.
To be clear, when they invade other nations, Fascists don’t even try to pretend it is for their own good. They are simply Vikings on a raid, who intend never to leave, and to do like the Vikings did, and enslave anybody they want as slaves.
The paradigmatic Communist War, on the other hand, is that of internal subversion, in which they get Fifth Columnists in key posts, and desecrate and denigrate the cultural and political institutions by which that nation maintains itself. The lie is always that they are rescuing the nation from some evil supposedly superior to their own.
This applies even in the case of naked aggression, as in the Soviet occupation of Eastern Europe, the invasions of Czechoslavakia and Hungary, the invasion of South Vietnam by their Communist neighbors, and many others. Such incursions were claimed to be for the good of all concerned.
Practically, though, they were still Fascist. The confiscated wealth of Eastern Europe was used to buoy the Soviets up long after the failure of their economic system became obvious; and of course Party bosses to this very day in China and Cuba are able to live much better than those they rule over, since they have legally protected access to the fruits of their labor, like plantation owners of old.
Again: Plus ca change, plus c’est la meme merde.