Comandos de Guerra

2nd Edition
From the back cover of the 2nd edition (in Spanish the original)

Se exigía a los Comandos que fueran aptos, que supieran nadar, que pudieran manejar cualquier vehículo de motor, pero la condición indispensable era que cualquier comando podía pedir regresar a su unidad cuando acabara la misión
Pocos tenían la oportunidad de hacerlo...

(in English)

It was demanded to the Commandos that they were fit, that they could swim, that they could use anykind of motor vehicle, but the essential condition was that any commando could return to his parent unit once the mission was over.
Few had the chance to do it