fighter_aircraft = {
    name = DOCTRINE_TRACK_FIGHTER_AIRCRAFT
    background = "GFX_air_superiority_bg"
    icon = "GFX_doctrine_milestone_fighter_air"
    icon_frame = "GFX_doctrine_decor_air"
    mastery = {
        multiplier = 8.0 
        equipment = {
            fighter
            interceptor
        }
    }
}

strike_aircraft = {
    name = DOCTRINE_TRACK_STRIKE_AIRCRAFT
    background = "GFX_battlefield_destruction_bg"
    icon = "GFX_doctrine_milestone_striker_air"
    icon_frame = "GFX_doctrine_decor_air"
    mastery = {
        multiplier = 8.0 
        equipment = {
            cas
            naval_bomber
            suicide
        }
    }
}

medium_aircraft = {
    name = DOCTRINE_TRACK_MEDIUM_AIRCRAFT
    background = "GFX_operational_destruction_bg"
    icon = "GFX_doctrine_milestone_medium_air"
    icon_frame = "GFX_doctrine_decor_air"
    mastery = {
        multiplier = 8.0 
        equipment = {
            tactical_bomber
            heavy_fighter
            scout_plane
        }
    }
}

heavy_aircraft = {
    name = DOCTRINE_TRACK_HEAVY_AIRCRAFT
    background = "GFX_strategic_destruction_bg"
    icon = "GFX_doctrine_milestone_heavy_air"
    icon_frame = "GFX_doctrine_decor_air"
    mastery = {
        multiplier = 8.0 
        equipment = {
            strategic_bomber
            maritime_patrol_plane
        }
    }
}