Marrett spent four years in the 84th Fighter Interceptor Squadron at Hamilton Air Force Base, California, flying the McDonnell F-101B Voodoo.

[4] While at the school, Marrett flew a variety of aircraft including the Northrop T-38 Talon, Lockheed F-104 Starfighter and General Dynamics F-106 Delta Dart.

[6] From 1968 to 1969, Marrett flew the Douglas A-1 Skyraider as a "Sandy" rescue pilot in the 602d Fighter Squadron (C), C for Commando, from Udorn and Nakhon Phanom Royal Thai Air Force Bases, Thailand.

[9] For the next twenty years, he flew test programs which helped develop attack radar and missiles for the Grumman F-14 Tomcat, F-15 Eagle, F-16 Fighting Falcon, F-18 Hornet, and an early version of the B-2 Stealth bomber.

He is one of the founders of the Estrella Warbird Museum at the Paso Robles airport, where he enjoys flying his privately owned plane, a 1945 Stinson L-5E Sentinel.

[16] On December 9, 2016 he received the USAF Test Pilot School Distinguished Alumnus award during the graduation ceremony for Class 2016A at Edwards AFB, California.

[17] This award is presented to a USAF TPS graduate who has made significant and lasting contributions to aviation science and the flight test community.