From the back of the bag:

The Lt. Blender® Story

"On a lonely Caribbean island, a legend was born. Lieutenant Blender's story began as US paratroopers held local feuding factions at bay.  He became infamous for quenching the thirst of the troops with frozen margaritas during the weekend beach party breaks. 

One fateful day, he discovered tragically his bent blade blender would crush no more.  Not to be deterred, he filled several empty ration bags with a favorite blend of line, lemon and orange juices, then topped them off with tequila and triple sec.  With a quick shake, he tossed the lot into the mess hall freezer for a quick freeze.

That afternoon, he 'chuted to the beach with an ammo sack with the now-frozen mixture of awesome margaritas, no ice, no mess, just great convenience and a sensational sparkling taste.  The rest is history."