Some units of the Marine Corps were using M60’s with reactive armor panels in the first Gulf War, and used them very effectively.
I doubt they’d be getting the basic M60 model, any left in US storage are going to be more recent models. The suffixes aren’t always used, just as a report referring to an “M1 Abrams” doesn’t necessarily mean it’s a plain version from around 1980.
My statement was based on the article.