Sure. Basically, Armor Types 1-20 are for personal armor. Vehicles like tanks and Starships have armor that goes from 21-30, and is called Construction Armor Type (CAT) rather than just Armor Type. The construction armor types have their own attack charts and critical tables, and are much harder to damage when using small arms. So for example, on the Small Arms vs. Construct Armor Types table, the maximum at Dagger could do against AT 21 would be 3A, and that critical will be against the armor rather than the pilot; it will be things like servo malfunctions, damage to shields, etc. Against AT 22, the maximum result a dagger could get would be 2 hits (no criticial).
So basically, CATs are heavier armor types of the sort you find on powered armor, tanks, and spacecraft. These are much harder to damage if you are using small arms, and the damage goes to the vehicle rather than the pilot.