The 8th Medium Regiment, known in the 1950s as the 19th Composite Regiment, was created in February 1968 to provide a united administrative command of several independent artillery units in the Holsworthy Barracks area and had the primary role of providing support to the School of Artillery.

While in Malaysia, the battery provided fire support during the Kesang River incursion by Indonesian forces.

While serving in North Borneo, equipped with L5 Pack Howitzers, the battery provided defensive support to the 3rd Battalion, Royal Australian Regiment, as well as Ghurkha, and British Battalions undertaking operations; it also fire support for secret Claret operations in Indonesian territory.

The 103rd Field Battery (Howitzer) was reformed after the First World War as part of the Citizen Military Forces from 1920 to 1941 stationed at Victoria Barracks, Paddington, moving to Guilford, Western Australia in 1921.

It was again deployed, this time to South Vietnam, with the new light L5 105 mm howitzers in May 1966 at the Nui Dat Task Force base, from which it contributed significantly to the outcome of the Battle of Long Tan.

On 19 June 1967, it became the 103rd Independent Medium Battery stationed at Gallipoli Barracks, Holsworthy, supporting the School of Artillery, providing gun salutes, and conducting some limited trials.

However, this non-combat role ended on 16 April 1968 when the battery joined the 19th Composite Regiment (RAAC), located at Kokoda Barracks.

During 1996, the 101st Field Battery was removed from the 1st Field Regiment and embedded as a Fire Support Company in the 6 RAR, which adopted the A 21 Motorised Battalion structure that included supporting arms under the Restructuring of the Army (RTA) initiatives trial.

While preparing for the move from Sydney to Darwin, the 103rd Medium Battery deployed its elements to East Timor as part of the INTERFET, and later as a part of a UN Peace Keeping Force OP TANAGER, and was later joined by the newly recreated 101st Medium Battery.

[4] In January 2011, the Australian Regular Army's field regiments were reorganised in preparation for re-equipment with new guns and battle management systems.

Under the new structure, each regiment is capable of providing a brigade-level Joint Fires and Effects Coordination Centre (JFECC) and every observation post battery provides a battle group JFECC as well as three combat team joint fires teams (JFT).

[8] In 2008, the Governor-General had awarded the 102nd Field Battery with the Honour Title 'Coral' in recognition of conduct during the Battle of Coral in the Vietnam War.