Does The Marines Accept Penn Foster High School Diploma?

Yes they will, Penn Foster was first recognized and accepted by us army so I think that answers your question. Now Penn foster is also Accredited and recognized by accrediting agency called DETC, so now Penn Foster high school diploma is good for us amy, marines, us navy, get a better job, and the best thing,, you can get into a college with it. Good luck!

Are penn foster diplomas accepted by the marines as a tier 1

The US Army will not accept my Penn Foster High School diploma, I have not checked with the Marines though.

No we would look @ it if it was a GED. We do not accept that.
Gysgt J