Career
Wiercinski joined the United States Army in 1979. On December 20, 1989, then Captain Wiercinski, Company Commander of Bravo Company, 3/75 Ranger Regiment, led his rangers during a night-time combat jump into Rio Hato, Panama during Operation Just Cause, assisting in the Regiment"s successful seizure of the airfield. He was previously the Deputy Commander for Support, of the Multinational Division North, Iraq.
The troops under his command were responsible for a large part of Iraq, stretching from Baghdad to the Turkish border, and east and west to the borders of Iran and Syria.
During Operation Anaconda (2002), in Afghanistan, Wiercinski (then a Colonel) was commander of the 187th Infantry Regiment (a k a "The Rakkasans"), 3rd Brigade, 101st Airborne Division (Air Assault).