Wikipedia
Attack Transport is a United States Navy ship classification for a variant of ocean-going troopship adapted to transporting invasion forces ashore. Unlike standard troopships – often drafted from commercial shipping fleets – that rely on either a quay or tenders, attack transports carry their own fleet of landing craft.
They are not to be confused with landing ships, which beach themselves to bring their troops directly ashore, or their general British equivalent, the Landing ship, infantry.
A total of 388 APA (troop) and AKA (cargo) attack transports were built for service in World War II in at least fifteen classes. Depending on class they were armed with one or two 5" guns and a variety of 40mm and 20mm anti-aircraft weapons.
Usage examples of "attack transport".
A smuggler named Roark Garnet is forced down on the planet New Bakstre, and his co-pilot Hawk Carrow is wounded and taken aboard the Imperial attack transport 'Regina Cayli'.
His last post had been as an assault shuttle section leader aboard the big Marine attack transport Leutzen, where his piloting virtuosity had no doubt been properly appreciated.
Breakstone, a thick-faced man with bristly hair and a large knobby nose, sat in his swivel chair with his back to his desk, staring out at the harbor, regarding with mingled yearn-ing and irritation an attack transport far below which swung slowly in the tide current to its anchor chain.
Marie, back aboard her attack transport to rearm and refuel, heard the announcements and commands over the PA and went cold, as the Earth fleet began to break off contact and withdraw.