McDonnell F-15A Eagle

The largest operator of the McDonnell F-15A in the world is the United States Air Force who, in November 1974, took it into service. We are covering the next squadrons in this post:

• 555th Tactical Fighter Squadron: After 9 years of combat operations in Vietnam, the squadron returned to the United States in 1974 to Luke Air Force Base, in Arizona. There they replaced their F-4 Phantoms II for the F-15A and became part of the 405th Tactical Training Wing. They retained the Eagle until being deactivated in March 1994. 
• 5th Fighter Interceptor Squadron: This squadron replaced their aging F-105 Delta Darts for the F-15 in 1984 and retained them until 1988 when it was deactivated. 
• 43rd Tactical Fighter Squadron: The 43rd was the first unit to convert to the F-15A Eagle in Elmendorg Air Force Base, in Alaska, where it developed its own training programme and made the very first low runway condition tests with the F-15A. They retained the F-15 until 1994 when it was deactivated.
• 461st Tactical Fighter Training Squadron: This one was reactivated in July 1977 at Luke Air Force Base, in Arizona. It was intended to be a Replacement Training Unit (RTU) for the F-15A. They had the F-15A until 1982 when it was replaced by the F-15B and F-15C.

Sources:

1. https://en.wikipedia.org/wiki/McDonnell_Douglas_F-15_Eagle

2. https://en.wikipedia.org/wiki/555th_Fighter_Squadron

3. https://en.wikipedia.org/wiki/5th_Flying_Training_Squadron

4. https://en.wikipedia.org/wiki/43d_Fighter_Squadron

5. https://en.wikipedia.org/wiki/461st_Flight_Test_Squadron

6. Salamander Books - The Complete Book of Fighters