Heads of State - group - was created in 2008.
New Burnett Heads Light was created in 1971.
MVM Group was created in 1948.
BMB Group was created in 2004.
Catlin Group was created in 1984.
Sedgwick Group was created in 18##.
The term "heads of state" is used because "head" is a singular noun that describes the role or position, while "state" is also singular, referring to the governing body. In English, when referring to a collective group of individuals occupying the same role, the phrase maintains the singular form for both nouns. Thus, "heads of state" correctly indicates multiple leaders of different states. Using "heads of states" would imply multiple heads for each individual state, which is not the intended meaning.
In Our Heads was created in 2011.
Counting Heads was created in 2005.
Out of Our Heads was created on 1965-09-24.
Dog's Heads was created in 1955.
Skull Heads was created in 2009.
The Heads of Cerberus was created in 1952.
Knuckle Heads was created in 1993.
Turn Heads was created in 2008.
Out of Our Heads - song - was created in 2007.
Heads Will Roll was created in 2006.
Talking Heads was created in 1975.