Republic of Singapore Air Force (RSAF) and Republic of Singapore Navy (RSN) personnel will soon receive new combat uniforms, commonly known as No. 4 uniforms. To meet the varying demands of the 3rd Generation Singapore Armed Forces' (SAF) operating environment, the SAF had introduced a new combat uniform for Army servicemen in 2008. The equipping of RSAF and RSN servicemen with the new No.4 uniform is part of the SAF's continuing effort to enhance the servicemen's survivability and operational effectiveness. This change will be phased-in progressively over the next three years.

For RSAF servicemen, the No.4 uniform will replace the current RSAF coverall for Air Force Engineers. Air Warfare Officers in the Command, Control and Communication community, as well as Unmanned Aerial Vehicle Pilots and Systems Specialists, will wear their No.4 uniforms during duty. For RSN servicemen, the No. 4 uniform will replace the Naval Combat Rig, worn by personnel on board ships, at naval bases and in base defence squadrons. The new No. 4 uniforms will debut at this year's Singapore Armed Forces Day Parade and National Day Parade. Equipping for active servicemen will commence in the later part of 2012 while Operationally Ready National Servicemen will be progressively equipped from 2013 onwards.