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Retired Col. Bob Harkins poses for a photo on May 19, 2014, at Fort Campbell, Ky. Harkins has seen his son follow in his footsteps. Harkins led the "Rakkasans," the 187th Infantry Division, 3rd Brigade Combat Team of the 101st Airborne Division at Fort Campbell into combat at the Battle of Hamburger Hill in May 1969 in Vietnam. Four decades later, his son, Lt. Col. Patrick Harkins led the unit into combat in Afghanistan. (AP Photo/Brett Barrouquere)

FORT CAMPBELL, Ky. (AP) — An Army officer and his veteran father have an unusual bond for Father's Day.

Lt. Col. Patrick Harkins and his dad, retired Col. Bob Harkins have led the same unit into combat four decades apart. Patrick Harkins took the unit known as the Rakkasans from Fort Campbell, Kentucky into battle in Afghanistan. Bob Harkins led the same unit into combat in Operation Apache Snow, better known as the Battle of Hamburger Hill, in Vietnam in 1969.

While the military has long had family legacies — and featured them prominently in Father's Day celebrations — the Harkins' achievements stand out. Capt. Charles Emmons, a spokesman for the brigade, said it appears to be the first time a father and son have commanded the same unit decades apart.