Which is most useful: calculating for multi-serial convoys, knowing doctrinal attack/defend ratios or calculating for engineer obstacles?

5 people responded to this survey between 4/22/2016 - 4/22/2016.

20%

1 participant responded: knowing how to calculate for multi-serial convoys?

20%

1 participant responded: knowing doctrinal/traditional attack and defend ratios?

60%

3 participants responded: knowing how to calculate for engineer obstacles?