Marine Squad 303 was a unit within the Republic of Haven Marine Corps in the 16th Century PD. After witnessing them in action in the Secour System in 1533 PD, Colonel Jean Massingill requested to be put in charge of the 303rd once she had switched from Manticoran to Havenite service. She was aware that they were not the finest unit in the Marine Corps, but intended to make them exactly that. (MA1)