The personnel for MONAB IX began to assemble at R.N.A.S, Middle Wallop on July 1st 1945, like MONAB VIII this was to support Fighter aircraft only, the unit being allocated the following maintenance components:

M.M. 8 Corsair II & IV - Seafire L.III & XV .
M.S. 15 Hellcat ?
M.S. 16 not known.

It is not known if this unit undertook a trial installation.

The heavy equipment of MONAB IX departed from Liverpool, bound for Sydney, together with MSR 10, sailing on July 20th.

MONAB IX Commissioned at R.N.A.S. Middle Wallop as an independent command bearing the ship's name HMS NABROCK on August 1st 1945. Captain. J.S.C. SALTER DSC, OBE, in command.
 

The surrender of Japan on August 15th caused  the Admiralty to take stock of MONAB operations, the departure of MONAB IX was delayed by a week, many personnel being sent on short home leave on VJ Day. Under normal circumstances a MONAB would sail three weeks after commissioning.

MONAB IX personnel together with the remaining stores & equipment sailed for Sydney onboard the MV Dominion Monarch sailing from Liverpool on August 30th, calling at Wellington and Christchurch in New Zealand before docking at Sydney.

The men of HMS Nabrock were to spend a short time under canvas at Warwick Farm before being assigned to re-occupy the airfield at Sembawang on the Island of Singapore.

The transport carrying the unit’s heavy equipment was diverted whilst still en route to Sydney. The personnel were split into 4 groups, three travelling by air as the 1st, 2nd and 3rd phase advance parties, travelling by  RAF Dakota transport planes via Moratai, in the Dutch East Indies.

The remaining group, comprising of the main body of the unit embarked in the Australian  troop ship the M.V. Largs Bay for passage to Singapore.   This vessel was a vintage trooper, having been in service during World War 1, and the years had not been kind to her, the members of the main party being plagued by vermin from the moment they embarked.

The Largs Bay docked in Singapore on November1st, exactly 9 weeks to the day since the Dominion Monarch left Liverpool.

The advance party of MONAB IX commissioned Royal Naval Air Station Sembawang as HMS NABROCK, on October 5th 1945.

Sembawang airfield was littered with derelict Japanese aircraft and other debris and cleaning up the establishment was the first order of business.

One of the main tasks undertaken by MONAB IX was the assembling of crated American aircraft, many of which were Hellcats. Once assembled these brand new aircraft were ferried out to sea by aircraft carriers and dumped into the ocean. The Lend – Lease agreement with the United States, under which they were supplied, required their return or payment to be made for them once the war was over, destroying them was the chosen solution.

1700 squadron's ‘C’ flight arrived from RNAS Katakurunda on November 8th with their Sea Otter aircraft for a brief detachment, returning to Katakurunda on the 20th. This was to be the only  squadron to visit Sembawang before H.M.S. Nabrock was paid off.
 

HMS NABROCK & MONAB IX paid off at RNAS Sembawang on December 15th 1945, the station re-commissioning the same day as HMS SIMBANG.  Effectively the MONAB ceased to exist, the ship's company being retained as the complement for the new naval air station.

MONAB IX was to be retained at Sembawang as an enhanced reserve MONAB, its name and number being deleted; held in storage on a care & maintenance basis for reactivation should it be required. Its existing components were supplemented by extra equipment and vehicles recovered from the recently paid off units in Australia.  It is believed that this reserve unit was maintained in storage at Sembawang until at least the mid fifties.