And came across this...
On the left, a young Lt. John Marks, in 1991, early on in the Gulf War, showing off some fresh paint on his A-10. (He would go on to collect over 30 tank kills in Gulf 1, depending on sources).
On the right, Lt. Col. John Marks, still flying A-10's with custom paint (although the paint is now hidden behind a service panel). Most recent combat deployment is 2014 in Afghanistan.
Currently a Pilot instructor at Whiteman Air Force Base. In mid November, he crossed over the 6000 hour mark in the A-10, including 950 Combat Hours. So far.
"Marks plans on flying the A-10 until he is no longer capable, which gives him a few more years in the cockpit and the potential to reach 7,000 hours."
http://www.afrc.af.mil/News/ArticleDisplay/tabid/5059/Article/1017122/whiteman-pilot-logs-6000-a-10-hours.aspx
https://warisboring.com/after-nearly-30-years-a-10-pilot-reaches-more-than-6-000-hours-in-the-cockpit-b65b1ee866f1#.rdy1buxbp
And with a bit of creative Google-Foo, lots more about this guy. Possibly the single most experienced combat pilot currently serving the in USAF.