A battlefield promotion (or field promotion) is an advancement in military rank that occurs while deployed in combat. A standard field promotion is advancement from current rank to the next higher rank; a "jump-step" promotion allows the recipient to advance by two ranks.
A battlefield commission is a commission granting an enlisted soldier a battlefield promotion to the rank of commissioned officer. The granting of a battlefield commission has its historical precursor in the medieval practice of the knighting or ennoblement of a plebeian combatant on the battleground for demonstration of heroic qualities in an exceptional degree. In the medieval context, this martial achievement was often one of the main restricted pathways into the sword-bearing feudal aristocracy.