The steady tactical advance begun by FAPLA on 2/6/87 has remain unchecked by UNITA and they are now at the source of the Chambinga River. In response to this Operation Moduler is launched with the establishment of Col. Jock Harris’ TAC HQ south of the Lomba River. Present at this TAC HQ is Colonel Mo Oelshig (SADF Liaison Officer with UNITA) and Colonel Piet Mulder from Rundu. The planning for Operation Moduler is fine-tuned from this TAC HQ

On 31 July 1984 the SADF’s Sector 10 HQ at Oshakati was attacked by PLAN insurgents at 02h00 firing 10 x 82mm mortars, causing damage to the state hospital