Brigadier General Michael J. Oster is the Assistant Adjutant General for the South Dakota Army National Guard. Oster began his military career by enlisting in A/Battery, 1st Battalion, 147th Field Artillery Brigade in Mitchell, SD as a 31 Kilo Combat Wire Installer in January, 1986. He received his commission from the South Dakota Military Academy Officer Candidate School in July of 1990.
General Oster served as a platoon leader, company executive officer and later commanded both the 665 Maintenance Company and the 727th Transportation Company. BG Oster served in staff positions with the 139th Transportation Battalion, 88th Troop Command, 109th Engineer Group and 109th Regional Support Group. He served as a Battalion Commander for the Recruiting and Retention Battalion from 2007 to 2009 and the 152nd Combat Sustainment Support Battalion from 2011 to 2014.
General Oster has completed two combat tours of duty; Operation Iraqi Freedom 2004-2005 with the Rapid Fielding Initiative and Operation Enduring Freedom in Afghanistan, as the 152nd Combat Sustainment Support Battalion Commander in 2013. General Oster also commanded the 109th Regional Support Group from 2016 to 2019.
General Oster has his Bachelors and Masters of Science degrees, both from South Dakota State University, is a graduate of the United States Army War College, through a Fellowship in the Josef Korbel School of International Studies at the University of Denver.