Barrels sit in a rickhouse at the Jack Daniel's distillery in Lynchburg, Tennessee.

WASHINGTON — America's oldest registered whiskey distillery has a particularly affectionate relationship with the U.S. military.

According to liquor conglomerate Brown-Forman, which owns the Jack Daniel's distillery, the U.S. military buys the most barrels of the brand's premium 94-proof Single Barrel Select Whiskey.

"Jack Daniel's has no better friends than the men and women of our nation's military and our veterans," Jack Daniel's Master Distiller Jeff Arnett told CNBC.

Arnett is the seventh person, behind founder Jasper Newton "Jack" Daniel, to hold the responsibility of supervising the entire whiskey-making process at the distillery. "We're especially proud they [U.S. troops] have taken a liking to our 'hometown product,'" he added.

Unlike its bourbon counterpart, Jack Daniel's is a Tennessee whiskey produced in the sleepy hills of Lynchburg, Tennessee. For the last 152 years, the rustic 1,700-acre operation has distilled and aged every single drop of Jack Daniel's.

As one of the most valuable alcohol brands in the world, the distillery ships out 15.3 million cases a year, sells to more than 165 countries and attributes 52 percent of its total output overseas.

But back home, the U.S. military remains the largest purchaser of the brand's Single Barrel Whiskey.