Possibly Giacoia inks, guys,
that's what I have in pencil on my data card for those two, but the penciler is definitely Irv Novick on #10.
For those interested in such things:
Hoosier Farmboy is Mike Suchorsky
The Eagle Screams is George Olesen
Betsy Ross Bags a Colonel is George Tuska plus inker
Battle of Wits is Everett Raymond Kinstler
Mail Call is Henry Sharp
Colonel's Girl is Mike Becker
40 Minutes With Destiny is Kinstler again.
#51 is trickier. I think all the G.I. Joe strips are penciled by Ernie Schroeder, with at least two different inkers. Novick is a possibility on the two noted (which I believe are inked by a different person than the first story), but I'd be hard-pressed to say so with any certainty.
Peace, Jim (|:{>