That's a dramatic oversimplification of how the military works. At the macro level the United States has strategic objectives supported by military capabilities. The capabilities are identified in operations plans and then resourced as needed when the plans turn to orders. The capabilities are spread across the military services in a force balance and include civilian employees and contractors. Within that the capabilities are put into a matrix that centers on sustainable readiness meaning every unit goes through a cycle of training windows and available windows. These capabilities are further nested with plans and operations to ensure capabilities are available and ready when they are needed. Further the force balance absolutely has to include the National Guard and Reserves and they absolutely have to participate in overseas operations that support strategic objectives of the United States to ensure the economic and physical security of the country. The reason is the Active component alone does not have all of the capabilities needed and sole reliance on the active component would degrade readiness so to the point they could not accomplish missions. Think about it like this, the National Guard and Army Reserve make up about one fourth of the total army strength. The National Guard has 27 of the 58 Brigade Combat Teams (BCT). That means active Army has 31 putting the National Guard at almost half of the Army's combat power. The reason is BCTs are expensive, especially Armored BCTs and to meet the budgetary constraints the Army has no choice to but to use the Guard. Not to mention the aviation brigades, two special forces groups, engineer brigades, specialty units etc. So basically the Army ran out of units years ago and fortunately congress had enough sense to create the national guard in it's current for of a capable strategic reserve that had the capacity to shift to an operational force in 1903. I don't know any Soldiers in the National Guard that have a US Army tape over their left pocket that feel any differently. Soldiers want to be in relevant and expeditionary force structure and they want to deploy and be Soldiers. You have an organized state militia, it's the State Guard and they are always looking for volunteers.