Hey, nice screenies of the P-38s Armistead.
I think their typical armament included 4 .50 cals plus a 20mm. I can't remember where I read it but, I think Kenney had some of his P-38s field-modified to carry 6 .50 cals in the nose and a 37mm to replace the 20mm. The skip-bombing tactics he developed were the curse of the IJN. There's even mention of it in my book, "Japanese Destroyer Captain". The IJN was terrified of this new bombing technique. According to the book, in their own words, the Japanese navy had no effective countermeasure against it.