It is reported that President Franklin D. Roosevelt kept a John Ek Commando Knife on his desk in the White House until the time of his death. This certainly seems possible, as photographs exist of John Ek with a large display of Ek Commando Knives on exhibit in the White House in 1944.
General George S. Patton, Jr. also owned a John Ek Commando Knife (as did several of his subordinates). John Ek even named his Model No. 6 the "Patton Knife." Captain Clark Gable, while not necessarily expecting to see combat, was none-the-less a customer of John Ek -- thinking that if the situation took him in harm's way, he would have a dependable knife.