Clear Rank

A common feature in the Ace Combat series, ranks give the player a certain letter grade after a mission's completion to evaluate their performance. The feature was first introduced in Ace Combat 04: Shattered Skies and has been utilized in almost every Ace Combat game since.

Description
The player is assigned their rank at the end of a mission, typically during the debriefing. The lowest rank is C, followed by B, then A, and finally S. Not all games feature all of these letters (for example, Ace Combat: Assault Horizon only features C, B, and A). The player is sometimes rewarded with bonus points depending on their rank.

In some games, medals or planes are unlocked by completing all missions with an S Rank.

Trivia

 * In Ace Combat 04, the player's rank is noted at the top-left of the screen in the Head-up display.