New Strategy [Desert Storm] opinions needed.

Desert Storm

Advanced Helicopters, faster but weaker Marines at the cost of slower and weaker
Tanks and Bombers. Faster and more expensive Transports and Submarines.

Tanks, (-1 attack, -1 defense, -1 range, +20 cost.)
Marines, (-1 attack, +1 range, -20 cost.)
Submarines & Transport, (+1 range, +50 cost.)
Helicopters, (+1 attack, +5 movement, +1 defense, +1 view range, +1Hp, -50 to cost)
Bombers, (-3 range, +20 cost.)

Remade, thanks to all posters.
Still need opinions on these changes, are they good or still some twisting and balancing to go?

Also i think that helicopters should be allowed the ability to take over a city, and not work as bombers or transport, same as destroyers.

Unit stats before & after the change:

Before:

Tanks, 8 Attack, 4 Defense, 3 ARB, 7 Hit points, 7 Range. - cost 120.
Marines, 7 Attack, 3 Defense, 3 ARB, 7 Hit points, 6 Range. - cost 160.
Helicopters, 6 Attack, 4 Defense, 5 ARB, 7 Hit points, 8 Range. - cost 200.
Bombers 6 Attack, 6 Defense, 3 ARB, 7 Hit points, 15 Range. - cost 160.
Submarines & Transports (10 Range.) - cost 250 for Transports, 200 cost for Submarines.


After:

Tanks, 7 Attack, 3 Defense, 3 ARB, 7 Hit points, 6 Range.) - cost 140.
Marines, 6 Attack, 3 Defense, 3 ARB, 7 Hit points, 7 Range.) - cost 140.
Helicopters, 7 Attack, 5 Defense, 5 ARB, 8 Hit points, 13 Range.) - cost 150.
Bombers, 6 Attack, 6 Defense, 3 ARB, 7 Hit points, 12 Range.) - cost 180.
Submarines & Transports (11 Range.) - cost 300 for Transports, 250 for Submarines.