Kusayas Army

There is no organization explicitly mentioned as "Kusayas Army" or "クサヤ部隊" within the Dragon Ball series. It's possible you're referring to Earth's Military, which is the main armed force on Earth, employed by King Furry. This military uses various weapons and vehicles similar to real-world militaries, including infantry, tanks, naval ships, and jets. The Earth's Military is featured multiple times throughout the series, but is often shown to be outmatched when facing powerful enemies like Saiyans, Frieza, and Androids. Another possibility is the Galaxy Soldiers, a mercenary group working for Bojack, who appear in the movie Dragon Ball Z: Bojack Unbound. They infiltrated an intergalactic martial arts tournament and fought against the Dragon Ball heroes. If "Kusayas" refers to something else, please provide more context for a more accurate response.