If you mean War Plan Orange is a fancy name for spamming subs, then yes I’ve tried it and liked it.
During the start of the game, subs are concentrated with the main Pacific USA fleet. Purpose: to conserve the main fleet.
-present subs would be sacrificed as fodder (but Japan won’t attack)
-new subs built 1-2-3 turn ago will deter the Japanese player from attacking the main fleet because anything sent to deal with the main fleet will be annihilated by these new subs.
During the middle game, the USA main fleet will survive The Naval Battle even when large number of subs are located elsewhere. So, large numbers of subs will approach the entire Japanese mainland territories.
During the end game, something’s gotta give.
I haven’t seen a proper response yet. Don’t forget, it does cost the USA 180IPCs or so to get reach naval equilibrium, then outbalance it and then keep the convoys going. It shouldn’t be surprising this strategy works considering the large investment. The important part is that it seems to be very cost effective.
On a side note: another aspect of this strategy I haven’t seen yet is the psychological effect is has on Japan :-D Look careful at your opponent when you announce you will purchase 8 subs for the 2nd time. There’s some serious despair when it hits him that this is his live now.