Unit	Attack	Defense	Move	Cost	Notes	Required Advance
Bomber	12	1	8	120	Ignores City Walls, has 2X vision and can spend 2 turns in flight	Advanced Flight
Fighter	4	2	10	60	Can attack air units	Flight
Nuclear	99	0	16	160	Does a nuclear attack. Invisible until it attacks	Rocketry + Manhattan Project must exist somewhere