The Ranae knife was specifically created for the "Conventus Ranae," a brotherhood of Danish Frogmen. This organization is dedicated to offering support and aid to current and former frogmen, as well as their families. Over the course of its 62-year history, only a little over 300 men have been able to join the prestigious Fromandskorpset. Every year, the unit receives around 500 to 600 applications for membership, but only a select few, less than a dozen, successfully complete the demanding nine-month training course. It's worth noting that Denmark's Crown Prince Frederik is a notable graduate of this program.