On March 19, 1984, KBTV became KUSA. The "9" in KUSA's logo is still being used today, and has been the only logo the station has used under that callsign. This is also shared with sister station WUSA in Washington, D.C.; the design is similar to the one formerly used by KMSP-TV in Minneapolis from 1972.
1984–1995 (primary) / 1995–present (secondary)
This logo was used from 1984 (when KUSA was ABC) until 1995 when KUSA became affiliated with NBC. It's barely used today.
KMGH's owner, McGraw-Hill (now S&P Global) had an affiliation deal with ABC and KCNC-TV was traded to CBS. So it made KUSA switch from ABC to NBC. The ABC affiliation moved to McGraw-Hill's KMGH-TV.