Today is the final day to snag R-Type Delta and R-Types from the US PSN store, where they are PS One Classics. All R-Type games are being removed from PSN, following a slew of similar delistings on the Japanese PlayStation Sore in August 2011 and R-Type's removal from the Wii Virtual Console in September 2011.
Developer Irem hasn't provided any reason for the delistings.