In addition, since beginning his work as the Punisher, Castle has used his military discipline and training techniques to update and expand his skills in areas that aid in his mission (disguise, acting, use of non-military weapons, etc.).
Selain itu, sejak memulai karyanya sebagai Punisher, Castle telah menggunakan teknik militer dan pelatihannya untuk memperbarui dan memperluas keahliannya di bidang yang membantu misinya (menyamar, bertindak, menggunakan senjata non-militer, dll.).