The Manticore Cross was the highest RMN decoration. It was awarded for gallantry in combat and only to officers of the Royal Manticoran Navy and Royal Manticoran Marine Corps.
The second-highest award for gallantry overall on Manticore, it was only one notch below the Star of Grayson and Parliamentary Medal of Valor in rank and importance. (HH1, HH2)
The award actually pre-dated the Star Kingdom, having first been given to Captain Franklin Casey in the early days of the Manticore colony. (MA2)