Attack mode only?
The modes are for scoring purposes only.
For everything you kiill or destroy you get perks in this game, regardless of scoring mode. And the primary type of your plane determines where they are going to. Fighters get fighter perks, bombers get bomber perks.
It's just that destryong 2 ord bunkers give you very little in perks ( zero point something), so it may go totally unnoticed when you also shoot down an enemy during the same sortie.