While there is no official version of Call of Duty: Modern Warfare for the PlayStation Portable (PSP)
References
The only official entry for the PSP is Call of Duty: Roads to Victory, released in 2007. Unlike the "Modern Warfare" series, this title is set during World War II and focuses on three campaigns: American, Canadian, and British. Search Confusion & Unofficial Files
or other PSP shooters (like Medal of Honor) to skin them with Modern Warfare assets, though these are unofficial.
While there is no official version of Call of Duty: Modern Warfare for the PlayStation Portable (PSP)
References
The only official entry for the PSP is Call of Duty: Roads to Victory, released in 2007. Unlike the "Modern Warfare" series, this title is set during World War II and focuses on three campaigns: American, Canadian, and British. Search Confusion & Unofficial Files
or other PSP shooters (like Medal of Honor) to skin them with Modern Warfare assets, though these are unofficial.