Major General Gregory J. Vadnais is the Adjutant General and the Director of Military and Veterans Affairs for Michigan. He commands and directs the Michigan Army and Air National Guard, with a total of 159 units.

Major General Vadnais' career began in 1970 as an enlisted soldier in the 107th Maintenance Battalion, Michigan Army National Guard. He entered the Michigan Military Academy Officer Candidate School and was commissioned in 1973 as a Second Lieutenant. Other notable assignments include Commander, 1-119th Field Artillery Battalion; Commander, 1-182 Field Artillery Battalion; Commander, 46th Brigade, 38th Infantry Division (Mechanized); Assistant Division Commander - Maneuver, 38th Infantry Division, and Commander, 38th Infantry Division (Mechanized).

During Major General Vadnais' tenure as Commander, 38th Infantry Division (Mechanized), over 9,000 soldiers were mobilized and deployed to 17 different countries including Iraq, Afghanistan, Bosnia, Kosovo, Egypt and to numerous other security missions in the United States and abroad. MG Vadnais was the Commander for Joint Task Force-Cyclone in response to Hurricane Katrina providing command and control of the over 14,000 Soldiers and Airmen deployed in Mississippi.