I don't think the US Army is isolated from its society. Rather, quite the opposite. I think the US Army to a great extent reflects "real" mainstream America much more than the opinons of the Rodeo Drive set. America has aways had (IMHO) great wellsprings of social conservatism, and from time to time these become the driving force in society: I would offer the US in the 1950's as an example. I believe they are holding sway in the US now. There is little doubt in my mind that the same conservative social trends that are so powerful in the US are reflected in the make up of the Army, particularly when I see so many ARNG and USAR soldiers, "citizen soldiers" whom we normally consider to be even more reliable indicators of society than Regular soldiers.
Organized religion, for example, plays a much bigger role in US society and politics than it does in Canada. Likewise in the US Army. For example, we start each working day here with a scriptural quote read by the CJTF Chaplain, as part of the morning shift change brief procedure. Now, as Canadians, with our almost ingrained belief in the separation of religion from government and its agencies, this would seem odd (some might even find it threatening...) but to the US folks here it is SOP. I do not say this to mock or fault the US: merely to make an observation.
I think we need to be careful not to overdo the attrition/retention thing. Yes, it is (or is rumoured to be) signifcant. Is the US Army falling apart. No. Is it combat incapable? No.
Does it mean that the US Army is cut off from society, or becoming irrelevant to mainstream thought? No, I don't think so. My feeling is that the US Army (especially its Reserve component) had an inept and ill-focused recruiting program that produced a disproportionate number of "job-seekers". When "the bell" went, these people realized that they were going to have to ante up and I think that a number of them don't like it. And, BTW, IMHO in the past we have had similar stupid recruiting with similar unhappy results (see other threads on this site...)
When I think about the incident with Rumsfeld where an outspoken soldier managed to embarrass a Secretary of Defense
I would say that the jury is out in the US Army as to whether or not he actually embarassed the SecDef. I have heard widely expressed opinions that the soldier was a "plant", an attention-seeker, or a sh*t disturbing Reservist who was trying to highlight the cracks in the Active-Res relationship in the US Army, in order to further the Res agenda.
If anything, I think we will see US society become more conservative than many of the people serving in its military who are actually out in the world, working side by side in foreign countries with Coalition allies, NGOs, local nationals etc and may have a much more balanced view of them than some of the folks back home.
Cheers.