The game was originally intended to be more graphic than the final release, with the initial goal being to earn a T Rating by the ESRB. However, part way through the game's development the ESRB introduced the E10+ Rating, so the Development Team decided to aim for that instead, resulting in some of the game's content being censored. This included changing the Black Arms' blood from red to green, editing scenes of GUN Soldiers' deaths, cutting out Maria's death, and censoring some pieces of dialogue.
Contributed by CuriousUserX90