Now have 2 sets of rules with optional rules.
Standard rules use a more Axis & Allies turn based system.
In standard rules, all Axis move first simultaneously, followed by Allies. That would encompass 1 entire season (4 seasons to a year).
Defender withdrawing still allowed, but can no longer move units into space the attacker is attacking (except for air units).
No more initiative in standard rules.
PM me to get an updated copy of the rules.