Destroyer

SUBHUNTER - Use Sonar, Depth Charges, Navigation
You're to seek and destroy an enemy submarine that has been sighted in your patrol area. Use your sonar to track the enemy submarine while maneuvering toward it. When your ship is above the submarine, attack with depth charges. Don't let this one get away.
SCREEN - Use Radar, Anit-Aircraft Guns, Navigation
Your task force has been positioned south of you. To the north are a large number of enemy aircraft heading toward your carriers. you must protect them at any cost. Your radar will give you warning of the airplanes before they are on you, so you can ready the Anti-Aircraft guns in time to defend yourself.
SCOUT - Use Sonar, Radar, Weapons Systems (dependent on enemy encounter)
An important convoy must cross a treacherous strait. You are to scout the intended route for enemy patrols. You will be notified as you reach each checkpoint. Maintain radio silence until you return to base to make your report. Avoid combat to keep the enemy guessing as to your intentions.
BOMBARDMENT - Use Surface Guns, Radar, Anti-Aircraft, Navigation
The Marines are landing! You must shell key parts of the island and maneuver close to the beach to search for flashes of enemy gun emplacements. Silence them with your main guns, avoid the return fire, and destroy any enemy aircraft threatening the invasion beaches. A combination of good radar operation, keen lookouts and sharp shooting will be necessary to protect the amphibious assault.
BLOCKADE RUNNER - Use Surface Guns, Torpedoes, Radar, Sonar, Navigation
One of our small island outposts has been surrounded by enemy forces. The garrison requires certain critical supplies in order to hold out. You are to take your battle seasoned crew and run the blockade. All stations must operate at full efficiency as you will be facing multiple threats fromships, submarines, and fighters.
CONVOY ESCORT - All Systems Used
Youhave been assigned to lead a slow merchant convoy to a beleaguered outpost, deep in enemy territory. Your assigned position is the LEFT front sector of the convoy's advance, your sister ships are assigned to other areas. It is your responsibility to run interference for those ships and to see the convoy safely to the harbor on time - regardless of enemy action.
RESCUE - All Systems Used, Pilot Signals, Enemy Guns
A friendly pilot has been shot down in your area and made it to a small chain of islands. You must rescue him soon (his signal beacon is rapidly getting weaker) and get him back to base. As his position is behind enemy lines, speed and stealth are very important. The pilot will signal SOS with a mirror when he sees you approach, but beware - that flash might also be enemy gunfire.

What is abandonware ?