Combined forces are best and you should never attack without them, but for a single unit , the BOMBER is my weapon of choice. Can strike deep into enemy territory,hit ratio is 2 out of 3, is only slightly more expensive than a fighter. BOMBER with heavy bomber tech and long range aircraft tech can strike Capitals way behind enemy lines and bring opponent to their knees. Only negitive, has no defensive value. Pure offensive weapon. These aircraft won the war in both theaters hands down. if you see your opponent starting to buy lots of bombers, your days might be numbered.