I applied in-person. The process took 3 months. I interviewed at US Army (Washington, DC) in June 2015
Interview
In person with Director Army National Guard. One on one with interaction based on scenario driven questions. The interview was in a setting of relaxation and not confrontational. The Director allowed note taking and ample time to respond to the questions.
Interview questions [1]
Question 1
How would you maintain the strength of the Warrant Officers in the Army National Guard world wide.