Of all the statist violations of individual rights in a mixed economy, the military draft is the worst. [...] It negates man’s fundamental right—the right to life—and establishes the fundamental principle of statism: that a man’s life belongs to the state [...] Once that principle is accepted, the rest is only a matter of time.
Capitalism: The Unknown Ideal,
We have a voluntary Army because those that want to support the State's agenda are those that join the military. This is a noble endeavor. But, what is a noble endeavor, if one desires to voluntarily join the purposes of the State, can become abuses of power.
States all have various interests, and not all of those interests will be those that everyone agrees with/to. Those in power that are our elected officials are to serve the public interests and when they don't it is the people's responsibility to hold these "servants" accountable. Those in government are also to be whistle blowers if they see something that is illegal, or unethical.
The "ideal" is always to allow liberty to the individual and when abuses of power happen, the individual must hold accountable those that have abused their position of leadership! Unfortunately, those, like the CIA agent whose career was ruined and they ended up leaving public service and Washginton, do happen. So, the best advice is to take care to associate with those that do not have agendas that you do not agree with, unless you have joined the military and have no choice!