-missile -- one shot, can be launched (see info launch). "marine"
-missiles may only be fired at ships, "tactical" missiles which don't
-have "marine" capability may only be fired at sectors.
+missile -- One-shot. Can either intercept planes (ability intercept),
+intercept tactical missiles (ability SDI), attack and intercept
+satellites (ability satellite), attack and interdict ships (ability
+marine), or attack and interdict on land (ability tactical).