Liebenberg was posted to London as a military attache in 1969.[5]: 25 In 1972, he returned from London to become second in command of the Army Gymnasium. Two years later he was back at Army Headquarters as a Staff Officer before becoming Director Infantry and, in December 1977, as a colonel, Officer Commanding 2 Military Area (later called Sector 10) at Oshakati.[5] He stayed there till January 1980, when he became Director of Operations at Army Headquarters in the rank of brigadier.[5]
In 1995, Liebenberg, former defence minister, General Magnus Malan, and former defence force chief, General Jannie Geldenhuys were tried for murder, as a result of a military operation in which several civilians had been killed. They were all acquitted.