There is just such a display on the N332 by the Centro Comercial Dos Mares at Santiago de la Ribera. The roundabout is just off Junction 777 of the AP7 Autopista del Mediterraneo. It is there in honour of the Academia General del Aire which is based there (Murcia San Javier airport was created from part of the military airfield).
https://goo.gl/maps/L1v5Cy7mm2n