Once the console is modified, you can generally play Caladrius by transferring the game files (often in XEX or GOD format) to the console's hard drive and launching them via software like Aurora or XeXMenu.
(or are you planning to mod one)?
Caladrius is a shoot-'em-up game developed by MOSS, frequently found in collections of games for modded Xbox 360 consoles (JTAG/RGH). Key Details for JTAG/RGH Caladrius [Jtag/RGH]