During his 12+ years of Active Duty Mr. O'Keefe served in the following positions.

• Rifle Platoon Leader, A Company 2 Battalion 36th Infantry Regiment, 1st Brigade, 3d Armored Division, Kirch Goens, Germany
• Weapons Platoon Leader, A Company 2 Battalion 36th Infantry Regiment, 1st Brigade, 3d Armored Division, Kirch Goens, Germany
• Executive Officer, C Company 2 Battalion 36th Infantry Regiment, 1st Brigade, 3d Armored Division, Kirch Goens, Germany
• Assistant Operations Officer (NRAS/EMAS), G3 Operations, 3d Armored Division, Frankfurt, Germany
• Supply and Transportation Control Officer, A Company, 34th Support Battalion, 6th Cavalry Brigade (Air Combat), Fort Hood, Texas
• Brigade Maintenance Management Officer, Brigade Material Management Center, 6th Cavalry Brigade (Air Combat), Fort Hood, Texas
• Commander, B Company, 34th Support Battalion, 6th Cavalry Brigade (Air Combat), Fort Hood, Texas
• Detailed Inspector General, U.S. Army Tank Automotive Command, Warren, Michigan
• Combat Arms Project Officer, U.S. Army Natick Research, Development, and Engineering Center, Natick, Massachusetts