the player can keep doing this until there are no more cards in the play field, at which point the player has to flip a card from their deck and begin the process anew with that one. a-3b model 37h, attack version of o-1e, with six machine guns, including two mounted in wings; 78 built. the leader of the front is the national bureau, led by the president. in practice however, it is less efficient since the extra random keys need to be stored, and the procedure to handle certificate failure is a (relatively complicated) rotation instead of a simple swap. 