In 1939, South Africa was originally divided under the Union Defence Force into 9 military districts.

[1] At the time, the command was headquartered at East London and comprised 2nd Infantry Brigade and 5 and 6 Batteries of the Permanent Garrison Artillery.

In 1980, Eastern Province Command and 6 SAI engaged in Operation Rain, which was support to the Transkei during a regional drought that lasted until 1981.

[5] The Support Base was established in April 2000, after the closing down of the Eastern Province Command.

[5] [6] South African Army Order of Battle 1940 11 Field Postal Unit