That's foremost a societal thing. Even in a volunteer service - who is willing to spend his life in the bogs, some desert or jungle, when others of his age have a familiy life, are much more comfortable and prosperous?
Excessive rotations and ratios of 6 or 7 to 1 are certainly undesireable. 4 to 1 I guess should be the goal. But the current armed forces still have a structure that is designed for a full-scale blow-up in case of mobilisation with a very top heavy structure. Also don't forget all the perks and promotions that come with deployments - everybody wants a piece!
And it's also a question of mentality. The warrior spirit, or whatever you might call it. Not doing it as a job, or as duty for the fatherland, but out of a mentality (not necessarily one compatible with civil society). It would also need a vastly different social structure of the forces, a different definition of duty, discipline, ranks. Strategic compression in the extreme, and almost like a religious order. Takes a certain desperado mentality. People who are fed up with society, those who are running away from something - you end with something like the Légion Etrangère. No way to build larger forces on that.
A more realistic way might be foreigners. Promise them U.S. citizenship and an education for X years in the bogs. No need to rotate them. The Byzantine way.
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