BLACK SCORPION NINJUTSU SOCIETY (Ninja Bob's Muay Thai, Nashville, Tennessee, United States)

Source:  Ninja Bob's Muay Thai; “Black Scorpion Ninjutsu Society Rank Explanation;” [Internet page]; at http://ninjabob.webs.com/requestinformation.htm; 2005.

BUDO RYU NINJUTSU (Budo Ryu Ninjutsu Dojo, Shawnee Mission, Kansas, United States)

Source: Jacobsen, Christa; "Budo Ryu Training Attire;" [Internet page]; at http://www.budoryuninjutsu.com/; 2004.

BUDO TAIJUTSU (The Hidden Mountain Bujinkan Dojo, Durham, North Carolina, United States)

Source: The Hidden Mountain Bujinkan Dojo; "Belt Progress & Advancement;" [Internet page]; at http://www.budosites.com/hmbd/index.cfm?page=12; 2009-11-26.

KOGA RYU NINJUTSU (International Ninjutsu Society & International Grandmaster Federation, Bridgeville, Pennsylvania, United States)

Source: International Ninjutsu Society & International Grandmaster Federation; "Belt Rank;" [Internet page]; at http://www.ninjutsusociety.com/id22.htm; 2009-11-26.

RICK TEW'S MARTIAL SCIENCE (California, United States)

Note:  The Mixed Martial Arts and Ninjitsu Home Study Program taught by Rick Tew lists five levels with associated colors, but does not indicate these are used as belts: Level 1 - Yellow, Level 2 - Orange, Level 3 - Green, Level 4 - Blue, and Level 5 - Red.

Source:  Tew, Rick; "Ranks in RTMS;" [Internet page]; at http://www.totalwarrior.com/Rick_Tew_s_Ninjitsu/Ranks/ranks.html; 2009-10-30.  Tew, Rick; "College of Martial Science Mixed Martial Arts and Ninjitsu Hoime Study Program;" [Internet page]; at http://www.totalwarrior.com/Rick_Tew_s_Ninjitsu/Ranks/ranks.html; 2009-10-30.

TOGAKURE RYU NINPO TAIJUTSU (Divine Mountain Tactical Training of Dallas, Dallas, Texas, United States)

Source: Divine Mountain Tactical Training of Dallas; "Rick Severe's Urban Combative Training Ranking System;" [Internet page]; at http://www.artofcombat.com/ninrank.htm;