The National Headquarters (NHQ) is located at 420 Beach Road and was officially opened on 23 July 1960 by the Yang di-Pertuan Negara (and subsequently President of Singapore), Encik Yusof bin Ishak.

The St John Ambulance Brigade (SJAB), the uniformed companion body of the SJAA, was established in 1887 to gather qualified volunteers to render medical aid during public events and emergencies.

The St John Brigade is the uniformed branch which provides First Aid and ambulance services, and is largely known for its Cadet (CCA) and Badger programmes.

It also organise meetings, social events, and other activities as desired by members to advance the work of St John and the Fellowship.

Students of participating schools may join St John Brigade as their Co-Curricular Activity (CCA), as cadet members.

Typically, cadet members undergo training in four core competencies – First Aid, Home Nursing, Transportation of Casualty, and Foot Drill.

A St John Day message by the Chief Commissioner is read out by the Principal or student leader during the morning flag raising ceremony.

On this day also, members reaffirm their loyalty to the Republic of Singapore and affirm their commitment to the twin mottoes of the Order, 'For the Faith' and 'For the Service of Humanity', in reciting the St John Pledge.Officers and members are entitled to receive the following Orders, Decorations and Medals: *To be worn on the right chest.

Shoulder flashes bearing the Maltese Cross with twin lions and unicorns, together with the words "St. John Singapore" are worn on both sleeves.