Countersign (military)

Countersign is an important practice in the military. It means that two different people must check a document or order to make sure that it is right. So if a military officer gives an order to the troops, another officer will use countersign to make sure the order is correct. This is important because sometimes orders can be given incorrectly or with bad intentions. With countersign, everyone can rest assured that an order is verified and safe to follow.