In the United States, Flag Day is celebrated on June 14,
it commemorates the adoption of the flag of the United
States on June 14, 1777, by resolution of the Second
Continental Congress.The Flag Resolution, passed on
June 14, 1777, stated: "Resolved, That the flag of the
thirteen United States be thirteen stripes, alternate red
and white; that the union be thirteen stars, white in a
blue field, representing a new constellation."

The United States Army also celebrates the U.S. Army
birthday on this date; Congress adopted "the American
continental army" after reaching a consensus position
in the Committee of the Whole on June 14, 1775.

In 1916, President Woodrow Wilson issued a proclamation
that officially established June 14 as Flag Day; on August
3, 1949, National Flag Day was established by an Act of
Congress.

Thomas Woodrow Wilson
(December 28, 1856 – February 3, 1924)

Walter Botts (1900-72)  posing as Uncle Sam in front of the
iconic poster, ca. 1970.

Artist James Montgomery Flagg referred to his own mirror image
for the portrait of “Uncle Sam” he created for the cover of the July
6, 1916 issue of Leslie’s Weekly. The figure in the long-tailed coat,
stove pipe hat and sideburns was captioned “What Are You Doing
for Preparedness?”
When asked to update the highly effective image for use in World
War 2, Flagg hired a Hoosier-born veteran who’d posed for Norman Rockwell. According to his widow’s memoir, Walter Botts was
chosen over other models for Flagg’s Army poster “because he
had the longest arms, the longest nose, and the bushiest
eyebrows.”

Botts reportedly suggested the pointing gesture when the artist
asked “Walt, what are you going to do with your long arms,
sitting there?”

James Montgomery Flagg
(June 18, 1877 – May 27, 1960)

The U.S. Army was founded on 14 June 1775, when the Continental Congress authorized enlistment of expert riflemen to serve the
United Colonies for one year.