Any activity that contributes to your victory is rewarded with Honor Points. Get them for every battle you fight in to open Battle Rewards chests and claim pilots' experience. The better you perform in battle, the more Honor Points you get.
Also, your Ag income is tied to Honor Points received, and the formula looks as follows:
1 Honor Point = 200 Ag
NOTE: The number of Honor Points players can get varies depending on their league—players get more Honor Points in higher leagues.