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The Marines were re-established as a branch of the SA Navy in 1979 to protect South Africa's harbours against attacks from land or sea. They were also deployed in South West Africa (Namibia), where they manned the twin-hulled harbour patrol boats and Vredenburg boats patrolling the Zambezi from Katima Mulilo. The Marines served in an infantry role on the Border until 1988 and were employed in counter-insurgency operations in South African townships in support of the South African Army. In September/October 1988 the Navy's largest and most successful peacetime exercise, Exercise Magersfontein, was held at Walvis Bay. The Navy demonstrated its ability to conduct operations far from its normal bases and revealed its amphibious capability by landing marines in Delta boats from SAS Tafelberg. The Border conflict ended in April 1989 and was followed by comprehensive rationalisation programmes in all arms of the South African Defence Force. The Navy's tiny share of the defence budget had dropped even further, but with the need for new ships now critical. To retain a new ship procurement programme and effect the financial cutbacks, the Navy elected to disband the Marines, some of its shore establishments and retrench 23 percent (2 258) of its personnel.