I was born in Guatemala and I am quite familiar with its history.
When I was in college I did a paper about the involvement of the CIA in the 1954 coup to get rid off the Guatemalan president Jacobo Arbenz Guzman, accused you be a communist.
The CIA backed a group of ultra right anti government group, led by an Army Officer, Col. Carlos Castillo Armas.
Part of the assistance included Four P-47N, and Two P-51, all nicknamed “Sulfato” (Magnesium Sulfate was used as a laxative), because literally scared the crap out of the civilian population.
The planes were based in Honduras and Nicaragua.
The aircraft were painted with a very light grey color, just before shipment to Honduras with absolutely no markings.
Later, after the coup and with Col. Castillo Armas as president, markings were added to the remaining P-47 and Two P51s.
The first two pictures are from the revolution, the third is after.
This one shows the “Volcán de Agua” (Water Volcano) in the background.