Based upon these 7 reasons, is the military a practical model of socialism?

Great lesson in Socialism. That's how the rich and elite do it, make the money here and hide it offshore.

So if we went socialist, would Hollywood and the NFL/NBA players accept giving up their high end cars, clothes and homes to help fund all these benefits for all? Think back to the days of 90% taxation on the rich.
The quick answer is no. We would still have an exempt elite that still does all the tricks to hide their wealth or still have loopholes in the tax code designed to shelter them.
Personally, the cat is already out of the bag and we can't steer away. In the end, we are supposed to celebrate everyone including the mediocre while allowing the exceptional the rewards they are due.

The military has some very practical applications of Socialistic concepts, however it has MANY of the drawbacks as well.

If you were to run down the list of comparative traits you would realize the USMC has all of the drawbacks. We are slow to adapt in many ways (we are also fast to adapt). We are wasteful with money & resources (perhaps not compared to the government as a whole).

That said, philosophically we have to stop looking at all this as an either or situation. We can use BOTH. We can have social programs and capitalistic endeavors. Use the best tool for the job. If capitalism is the best tool for telecommunication, use that. If socialism is the best way to have roads, use that.