What Does M&M Stand For? WWII Rations & Corporate History

In the summer of 1941, as the United States prepared for entry into World War II, a new candy hit American assembly lines. It didn’t look like the heavy chocolate bars of the era, and it wasn’t sold in traditional grocery stores. Packed into narrow cardboard tubes, the entire initial run was bought by the U.S. War Department for soldiers fighting in tropical climates. While M&M’s would go on to become one of the most profitable confections in human history. These candies, which defined the Mars candy empire, was originally not even a MARS product, but the product of an estranged son’s ambition. It was born of a tense, temporary alliance between two bitter rivals and a wartime monopoly on rationed cocoa.

The Father-Son Feud That Built an Empire

The story of M&M’s begins with a family rift. Forrest Mars Sr. was the son of Frank Mars, founder of Mars, Inc. (creator of the Milky Way and Snickers bars). After a childhood spent largely separated from his father, Forrest joined the family business in the late 1920s. However, the two men clashed fiercely over how to run the company.

Frank Mars was content with his domestic success, but Forrest aggressively demanded global expansion. The feud escalated until 1932, when Frank effectively pushed his son out of the company, handing him $50,000 and the foreign manufacturing rights to the Milky Way bar.

Forrest left for Europe, vowing to build a confectionery empire of his own. While living in Britain and traveling through Europe during the Spanish Civil War, he noticed soldiers eating small chocolate pellets coated in a hard sugar shell. The shell protected the chocolate from melting in the sun. This solved candy industry’s oldest problem of slumping summer sales.

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The WWII Hershey Alliance: Why Mars Needed Murrie

Many sources will casually tell you that M&M’s stands for Mars and Murrie. But very few explain why Forrest Mars needed Bruce Murrie in the first place, or why he was willing to share top billing with the son of his fiercest competitor. Nor will they tell you that the second “M” is a permanent historical artifact from an extremely brief window of time, one the modern company would love to pretend stands for something else.

The partnership certainly had nothing to do with friendship. It was a pragmatic alliance dictated by the harsh realities of wartime supply chains.

Upon returning to the U.S. on the eve of World War II, Forrest was determined to commercialize a heat-resistant, candy-coated chocolate treat. However, the design had had in mind wasn’t entirely original. Britain’s Rowntree & Company had been producing a virtually identical candy called Smarties since 1937. These were the small candies he had seen soldiers eating. And, because Rowntree had not secured trademark protections for the design in the United States, Forrest was free to adapt the concept.

As World War II loomed, the U.S. government tightly controlled national cocoa supplies. Hershey Chocolate held a virtual monopoly on military chocolate allocations, and as a new venture, Forrest couldn’t secure the raw cocoa needed to launch production on his own.

To bypass the rationing bottleneck, Forrest approached William Murrie, the president who ran day-to-day operations at Hershey. He pitched a joint venture and offered William’s son, Bruce Murrie, a 20% stake in the new business.

In exchange, Hershey agreed to supply the raw chocolate, manufacturing equipment, and engineering expertise needed to build the factory. The venture was named M&M Limited, representing Mars and Murrie, securing Mars a guaranteed pipeline to Hershey’s military chocolate rations.

100% Military Production in World War II

When production began in 1941, the U.S. War Department immediately recognized the utility of M&M’s. Because the hard sugar shell prevented chocolate from melting into a sticky mess in humid military theaters like the Pacific, the military agreed to purchase 100% of M&M’s factory output.

When M&M’s debuted in 1941, they were initially available to the American public in cardboard tubes. However, as the United States entered World War II in 1942, the War Department formally added M&M’s to military C-rations due to their heat-resistant shells.

With wartime sugar and cocoa strictly rationed, the military requisitioned 100% of M&M’s factory production. Suddenly pulled from grocery shelves and candy counters, M&M Limited launched a famous print campaign informing home-front consumers that “M&M’s Are Now 100% at War!” The ads explained the candy’s absence while building immense patriotic brand equity. By the time civilian production resumed in 1945, millions of returning GIs, and the families who had read about them in magazines, created an instant commercial explosion.

The “M” Stamp: Fighting Post-War Counterfeits

When M&M’s were finally released to the general public in 1945, sales exploded. However, the candy’s massive success triggered a wave of cheap knockoffs from rival manufacturers using inferior chocolate and unstable sugar coatings.

To protect its market dominance, the company introduced a custom black-ink “M” printed onto each candy in 1950 (which was later changed to white in 1954). Mars launched a massive national advertising campaign around the slogan “Look for the M on every piece,” turning an anti-counterfeiting measure into one of the most famous marketing hooks in television history.

The $1 Million Buyout and Erasing the Murrie Name

Despite the phenomenal success of M&M Limited, which was grossing millions annually by the late 1940s, the relationship between Forrest Mars and Bruce Murrie degenerated rapidly.

Forrest was famously autocratic, micromanaging the factory floor and completely ignoring Bruce Murrie’s operational input. By 1949, tired of being sidelined in his own company, Bruce Murrie accepted a $1 million buyout from Forrest Mars and walked away.

Once in full control, Forrest renamed the operation Food Manufacturers, Inc. and eventually merged it back into the main family business, Mars, Inc., in 1964.

While Bruce Murrie’s involvement was scrubbed from the corporate leadership, the second “M” in M&M’s remains a permanent historical artifact of the brief, lucrative alliance between Mars and Hershey.

The Birth of the Iconic “Melts in Your Mouth” Slogan

As M&M’s transitioned from military rations to civilian pantries in the late 1940s, right around the time Bruce Murrie was bought out, Mars faced a new challenge. He needed to explain to consumers why a hard candy shell was a good thing for a chocolate.

Forrest Mars already knew why a hard sugar shell made for a superior chocolate candy; he had built an entire factory around the concept. The real problem was communicating that utility to the public. Traditional early 20th-century advertising favored long-winded, full-page print manifestos lecturing consumers on manufacturing techniques or corporate virtues. But readers didn’t need a dry lecture on the mechanics of cocoa butter melting points, they already knew the frustration of sticky, melted summer chocolate.

In 1949, Forrest Mars hired legendary advertising executive Rosser Reeves, a pioneer of the “Unique Selling Proposition” (USP) at the Ted Bates agency. Reeves recognized that instead of writing dense advertisements, the goal was to distill the candy’s core mechanical benefit into a single, catchy consumer promise.

Reeves coined the famous slogan: “Melts in your mouth, not in your hand.”

Modern readers may not truly understand just what a home-run this slogan was. It solved a consumer “sticking point” in a way that suited high-frequency advertising. Today, we take such taglines for granted but this slogan solved two distinct marketing problems at once. While “not in your hand” promised clean, mess-free fingers, leading with “melts in your mouth” sent a critical reassurance to chocolate purists. The hard sugar shell was not a brittle, rock-hard barrier requiring a jawbreaker-like crunch to reach the center. Instead, it was an ultra-thin protective shield designed to dissolve on the tongue, preserving the smooth, luxurious melt expected of quality chocolate.

Rather than running lengthy magazine essays, Mars plastered this short, double-barreled hook across radio broadcasts, outdoor billboards, and early television spots. Paired with the debut of the white “M” stamp on every piece in 1954, the campaign bypassed corporate preaching entirely, transforming a functional heat barrier into one of the most effective advertising hooks in television history.

Chronology: How a Rival Venture Became Mars, Inc.’s Flagship Candy

To see how an independent WWII joint venture eventually became the cornerstone of Mars, Inc., here is how the corporate timeline unfolded:

1932 (The Family Split): Frank Mars pushes his son Forrest Mars Sr. out of Mars, Inc. Forrest moves to England with $50,000 and European Milky Way rights, building an independent candy and pet food business (Mars, Ltd.).
1937–1940 (The European Inspiration & WWII Bottleneck): Forrest observes hard-shelled chocolate in Europe (Rowntree’s Smarties in Britain). Returning to the U.S. to replicate the concept, he faces wartime cocoa rationing controlled by Hershey.
1940 (The Founding of M&M Limited): Forrest partners with Bruce Murrie (son of Hershey’s president) to secure raw chocolate and machinery. They found M&M Limited as an independent business separate from Mars, Inc., with Hershey holding a 20% stake.
1941–1945 (The WWII Military Monopoly): M&M’s debut. The U.S. War Department buys 100% of factory production for military C-rations, excluding the civilian market until after the war.
1949 (The Murrie Buyout): After years of conflict, Forrest buys out Bruce Murrie for $1 million, gaining 100% control of the company and renaming it Food Manufacturers, Inc.
1950–1954 (The “M” Stamp): To combat post-war knockoffs, the company begins stamping a black “M” (changed to white in 1954) on every piece, launching the “Look for the M on every piece” campaign.
1964 (The Ultimate Merge): After inheriting stock in Mars, Inc. and taking control of his late father’s company, Forrest officially merges Food Manufacturers, Inc. (M&M’s) into Mars, Inc., bringing M&M’s under the Mars corporate umbrella for the first time.

The Final Irony: The Unwanted Venture That Defined a Global Empire

The ultimate irony of the M&M’s story lies in how completely it inverted the destiny of Mars, Inc. Frank Mars had been content to run a successful domestic candy company, resisting his son’s aggressive demands for risk and global expansion. Had Forrest obeyed his father, Mars, Inc. may well have remained a modest mid-century candy maker, vulnerable to shifting economic tides, rising supply costs, and changing consumer habits.

Instead, a product born out of a bitter father-son exile, a stolen European idea, and a uneasy alliance with Hershey became the single most iconic, highest-selling confection in American history.

The small, sugar-shelled chocolate drop that Frank Mars never wanted, and that Forrest had to build using another man’s chocolate, didn’t just survive the mid-century corporate reshuffle. It grew to redefine the company entirely, proving that the son’s obsession with scale was right all along, at least from a business standpoint.