The basic difference between the two services boils down to a belief in people.
The Army believes that if shuffles and reshuffles the organization charts - if it changes regiments to Pentomic battle groups, then into brigades, and now into who knows what - that victory is assured, regardless of the quality of the soldiers in those units.
The Marine Corps believes that if it finds the right people, trains and motivates them properly, then the structure of the organization doesn't matter.
and that if the proper prostitute/spies are used...Marines will be happy to cough up intel.
Sorry, had to return some jabs.