The Mirage IIIEA were bought in two batches, the first one in 1971 and the second in 1978.
The first batch (10 aircraft) was capable of lunching the Matra 530 missile only.
The second batch (7 aircraft single seater) was also capable of lunching the Matra 550 Magic I, but those missiles were deliver just before the war in March 1982.
So the MIIIEA pilots didn't have any training in operating those missiles and only 7 aircraft were capable of lunching it.
The Argentine Air Force deployed its MIIIEA in two bases, Comodoro Rivadavia AFB and Rio Gallegos AFB.
But only the Rio Gallegos AFB was lunching MIIIEA missions to Malvinas.
Very few missions were flown armed with the MATRA 530 located in the center pylon.
The first mission on the May 1st, both MIIIEA were armed using a single MATRA 530, 2 MATRA 550 Magic I and the 2 DEFA 30 mm.
Both MIIIEA were radar vectored to a pair of SHR but the Cyrano IIbis couldn't lock any target flying below...so it was useless.
That's why the Argentine Air Force decided to retired the MATRA 530 because was causing drag and more fuel consuption without any real chance of hitting anything.