The Salem's main weapon is a double-barreled Proton Cannon with sufficient range to make it effective as an early shore-bombardment unit. It is also equipped with Nanite Torpedoes for attacking Submarines, as well as a Torpedo Defense to reduce vulnerability to Torpedoes. It's important to note that the Salem's cannon can out-range T2 Point Defence. Consider including one or two in a mid-game assault to lighten up the defences.