Lots of interesting perspectives given in this thread, very few, if any, I totally disagree with.
However, pertinent to assertion of SEAC "So, if you want to look cute with your skinny jeans and your beard, by all means do it someplace else. But quit wasting our time on something that doesn't have anything to do with kicking the enemy's ass," My perspective interpretation is the comment was more about attitude of being military more focused on looking cool than readiness to perform duties. If so, I would have presented the concern slightly differently.
As far as difficulties of military to acquire sufficient numbers of people into active (regular) military service and retain sufficient numbers in active (regular) military service, this has been problematic since 1950 which corresponds with conceptual policy implementation of the Total Force. This concept is an appropriate mix of active (regular) military force structure, reserve components force structure, supplemented with a civilian work force and contracted work force is the most cost effective and efficient mean to have a military force capable of winning the next war.
Concurrently, the technology of weaponry and armaments introduced concepts of mutual self-destruction and push button warfare of using missiles, UAVs, tactical nuclear weapons. This means those in power can hide away safely in their bunkers and push buttons rather than actually having to confront enemy forces in direct close combat.
Just finished listened to a bunch of talking heads discussing the military difficulty in obtaining volunteers for military service and decreasing numbers of ships and aircraft in the fleet and numbers and size of combat units. The assertion was buildup of military forces wasn't necessary as our weaponry and armaments are more effective and efficient than what our enemies have. Presuming this is both correct and accurate and with the Chinese in particular increasing their conventional military force structure the next war will not be won through conventional means as we are not building up our conventional force structure to counter their buildup.
Considering recent political decision to deplete our oil reserves combined with the industrial and manufacturing capability driven overseas, the retention and recruitment crisis is just a distracting inconvenience to distract the public from how much our politicians have sold out those who are not members of the political elite for their own personal gain.