Major Ronald Edward Markiewicz was commissioned as an Infantry Officer upon graduation from Officer Candidate School class 22-69 at Fort Benning, Georgia on July 19, 1969. His first duty assignment was as a Training Officer, Company B, 2nd Battalion, 3rd Advance Infantry Training Brigade, Fort Polk, Louisiana.

His notable duty assignments include: Rotary Wing Aviator, 71st Assault Helicopter Company, 14th Aviation Battalion, 16th Aviation Group, 23rd Infantry Division, Chu Lai, Vietnam; Commander, Headquarter and Headquarters Company, 50th Infantry Regiment, 1st Brigade, 2nd Armored Division, Fort Hood, Texas; Regional Training Officer, Army Recruiting Command, Midwest Region, Fort Sheridan, Illinois; Area Commander, Army Recruiting Command Midwest Region, Chicago District, Deerfield Area, Deerfield, Illinois; Logistics Officer, Supply Systems Management Division, 8th United States Army and United Nations Command, Yong Son, Republic Of Korea; Chief, Tank Automotive and Armament Divisions, Military Management Center, 13th Support Command, Fort Hood, Texas; and Operations Officer, Military Management Center, 13th Support Command, Fort Hood, Texas. His last duty assignment was served as Advisor, Troop Command, Puerto Rico National Guard, San Juan, Puerto Rico.

His military education includes: Officers Rotary Wing Aviator Course, Infantry Officers Advance Course, Supply Management Officers Course, and Defense Resources Management Education Center, Analytical Decision Making Course.

His highest military awards include: Silver Star, Distinguished Flying Cross, Bronze Star Medal, Purple Heart, Meritorious Service Medal (3rd Award), and Air Medal (18th award).