I have written and article on this for a few web sites. Ous or Oss is the shortended version of “I will endevour” in Japanese or “I will Push to excel” it comes from two words Oshi (pronounced Oshh) and Kashutsu or to exel. Said together its “I will push/endevour to excel”. This came from Master Kanazawa. Its an old Japanese Navy tradition that the Japanese learned from the British Navy. The Budoka (martial artists) adopted this habit.