A longtime member of the New York Army National Guard, in February 2024 he was promoted to major general as commander of the 42nd Infantry Division.

[2] Biehler participated in the Army Reserve Officers' Training Corps while in college and in 1987 he received his commission as a second lieutenant of Infantry.

[5] Biehler's field grade officer postings included: plans, operations, and training officer (S-3), Headquarters and Headquarters Company, 2nd Battalion, 108th Infantry, including deployment for Operation Iraqi Freedom in Dujail, Iraq; executive officer, Headquarters and Headquarters Company, 2nd Battalion, 108th Infantry (April 2005 to March 2008); liaison officer, Headquarters, 42nd Infantry Division (April to December 2008); commander, 2nd Battalion, 108th Infantry Battalion, including deployment to Shindand, Afghanistan during Operation Enduring Freedom (December 2008 to February 2013); and commander, 27th Infantry Brigade Combat Team (February 2013 to April 2017).

[5] Biehler received a Master of Strategic Studies degree upon completing the war college program of instruction.

[5] Professional military education Biehler completed as a general officer included the Army Strategic Education Program – Basic (ASEP-B), the Dual Status Commander Course, and the Joint Task Force Commander Course.