Yes, I'm being facetious, but if we're going to have reeducation camps paid by public money, I'd rather have them learn more useful things than how to handle military equipment.
What they learn is working in a team, taking responsibility and being accountable.
Armed forces are the legitimized monopoly of violence which are for better or worse absolutely necessary for the nation states of today and any time in the foreseeable future. The military's rigid command hierarchy and strict rules and ideas of duty really don't have any place in free society outside that monopoly. While it is absolutely necessary in a military to have the actions of many people dictated by the will of a single person, outside of that environment the necessity would be artificial and arguably the situation would be tantamount to slavery.
In other words it just isn't possible to recreate the structured existence of a soldier outside of a military force without extending the military well beyond the external force it must exclude itself to or legitimizing pseudo-slavery conditions. The costs of military upkeep are likewise very justifiable. Not that everything the military does is good or necessary, but the baseline of _having_ a military is fairly universally accepted as needed. Making up something else would look like a handout or a cost center and wouldn't stand up to the test of time and support.
[anecdote] I used to know someone who was an addict. Judge gave her the choice of going on probation for a year, or 45 days in jail. The catch was if she took the probation offer but was picked up for drug offenses in that time, it was an immediate sentence of a year in jail.
She took the 45 days. Better the devil you know than the one you can't control! [/anecdote]
[0] - https://www.stripes.com/news/judge-said-army-or-jail-but-mil...