I don't really use the army for anything, some people don't use trains or the road.
In a country like the US, I'd be willing to wager a very large some that very few people do no personally profit from the low prices on many consumable and durable goods that are in part so low due to the excellent transportation infrastructure provided by the government. Just because some one doesn't ride on a train or road, doesn't mean that they do not benefit from their existence. Only people with little or no contact with anyone outside their home town (like Theodore Kazynski (sp?) in between blowing people up) do not benefit from transportation infrastructure. Perhaps the world would be better off if we were a nation of hermits that made our own screws, killed our food, etc., but as a society countries are better off investing in infrastructure.
As for the army, without one there wouldn't be a country to live in (for better or for worse) to live in. Saying that a citizen of a nation-state doesn't use the army is ridiculous, especially in a country like the US where the military is quite active in civilian life in beneficial ways. For example, you can thank the US army for the Internet. The national guard and the army corps. of engineers were the backbone in keeping back the flooding of the Misouri river several years back.
On the other hand I may one day need welfare or health care, while they may not pay tax these are services provided to people under the government's care.
The difference between infrastructure items (armed forces, highways, train tracks, etc.) and welfare (food stamps, general assistance, medicaid, aid to families with dependant children, the earned income tax credit, etc.) is that the former is necessary for a viable nation and the latter is done because the government doesn't want to see excess sufferring.
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