Could it be Israeli tactics?
An interesting snippet from "My experiences in the Malvinas", I have condensed the content:
"In 1978 the need to purchase a Fighter Bomber for the fleet was identified. Israel was the only realistic provider due to the European and American embargo in place at the time. An initial order of 24 IAI Nesher was placed, the aeroplanes received the name "Dagger" which really was the code name for the project to purchase the aeroplanes from Israel!
With a view to accelerate the acceptance into service of the new aeroplance, pilots were sent to:
-VIII Brigade to train with the Mirage III contingent
-Quinones Gonzalez Air Base (Peruvian Air Force) to train with Squadron 611 equipped with Mirage 5P.
In late October, the rest of the personnel were sent to Eitam Air Base in Sinai for training with the Israeli Air Force. Eight of those pilots underwent training in aeroplanes marked for the FAA with no markings as the whole operation was still under a cloud of secrecy. (It appears most of these pilots were ex-MIII)
Argentina was the first Latin country to receive Air Warfare instruction by Israel. The same course was later available to FAA pilots at Tandil base in Argentina, under the Israeli instructor Shlomo Erez.
The first batch of Nesher was loaded on 26th November 1978 on the "Jaspers" to Buenos Aires."