yes, it has been confirmed that power received from missiles is added into the factor for your % lost...
I don't feel that it should be as this gives the missile holders an advantage over players that don't carry missiles...
Take a player who is at 10Mil power... he adds in 2Mil worth of missile power = new total power of 12Mil power
if said player w/ missile power looses 6Mil power during a battle... he lost 50% of his total power
- vs -
a player without missiles at 10Mil would loose 60% if he lost 6Mil power during an attack...
** now reminding you that it is NOT possible to destroy missiles during a battle nor do missiles destroy armies **
so players that run missiles for added power have an unfair advantage over players that don't because there is 'untouchable' power that can't be destroyed during a battle...
do you feel that the % calculation should be based on Missile power + land/army power -or- just land/army power -or- just army power

