“LTJG BUSH” painted in the ... uhh ... “cockpit” of the push truck.
I think whole cart is painted in scheme of his Grumman Avenger. Note “barbara” stenciled on LF wheel well. USS San Jacinto was carrier he flew off on last mission => CV-30 was escort carrier:
http://knowledgerush.com/kr/encyclopedia/USS_San_Jacinto_(CV-30)/
Blue top, with gray underbelly. Cart has wartime insigna.