Harbour Fire Command was re-designated 1 Heavy Regiment Royal Malta Artillery in February 1940. By June 1940 the batteries were as follows – 1 Battery, Fort San Rocco & Delimara; 2 Battery, Fort Tigne & Campbell Battery; 3 Battery, Fort St Elmo & Fort Ricasoli. In December 1940 all Heavy Regiments were re-designated Coast Regiments. The Regiment converted to 1 Heavy Anti-Aircraft Regiment RMA in June 1956.
| Aug 39 | Formed by re-designation of Harbour Fire Command, Fort St. Elmo | Malta |
| Aug 39 | Harbour Fire Command | Malta |
| Dec 40 | Became 1 Coast Regiment RMA | Malta |
Batteries
| Aug 39 | 1, 2, 3 |
| Oct 40 | 1, 2, 3, 4 |