Now it appears that the Mountain West is going to make Hawaii a full member. They play in the Big West for everything but football. If they do this, the MWC can be done with 8 full members if they choose.
UTEP
New Mexico
Air Force
Wyoming
UNLV
Nevada
San Jose State
Hawaii
All are former WAC members. Wyoming and New Mexico were founding members with BYU, Utah, Arizona, and Arizona State in 1962. UTEP joined in 1968. Hawaii in 1979 and Air Force in 1980. So those 5 are longtime rivals. UNLV joined the WAC in 1996 and left in 1999 for the new MWC in 1999. San Jose State also joined the WAC in 1996 when it created the first super-conference (16 teams). Nevada joined the WAC from the Big West when 8 teams left to form the Mountain West.
Looking at the old 16 team WAC, here's where everyone wound up:
MWC: 7 (Haw, SJSU, UNLV, AFA, Wyo, UNM UTEP)
Pac 12: 3 (CSU, Fresno, SDSU)
Big 12: 3 (Utah, BYU, TCU)
American: 2 (Tulsa, Rice)
ACC: SMU