Harlan Beck and Jack O'Neill had served together in Special Ops. As a lieutenant, Beck had served with O'Neill in Operation Proven Force out of Incirlik, Turkey during the Gulf War, where he had flown an AC-130 gunship over Baghdad. Now a lieutenant colonel from the 10th Air Base Wing at the Air Force Academy, Beck encountered O'Neill's clone, Young Jack O'Neill, outside a liquor store in Colorado Springs. Unaware that O'Neill had siblings, he was suspicious of Young Jack's story about being O'Neill's nephew and of his attempt to buy alcohol, and he reported the encounter to the SGC, giving them a lead on the missing clone.
Portrayed by: Gregory Bennett
Cross Reference: Jack O'Neill, Young Jack O'Neill
Episode Reference: Fragile Balance