The ones I've got on tope of my head:
- Soudaishou 総大将 -> Supreme Commander
- Taishou 大将 -> commander
- Shireikan 司令官 -> commandant
- Shoutai 小隊 -> platoon
- Shoutaichou 小隊長 -> platoon leader
- Gunyouken 軍用犬 -> dogs in warfare/war dogs
- Gensui 元帥 -> (field) marchal
- Shousa 少佐 -> major
- Choui 中尉 -> lieutenant
- Gunsou 軍曹 -> sergeant
- Gochou 伍長 -> corporal
- Shoui 少尉 -> sub lieutenant
- Teisatsuhei 偵察兵 - scout
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Anyone else seen any more? ^^