WASHINGTON — As a 6-year-old child, camping in the Virginia woods, Simone Askew marched for fun, wielding a plastic gun and leading her young sister and friends in formation. A few years later, the sight of Navy midshipmen striding across an Annapolis football field solidified her desire to be the person who led troops.

“What does it take,’’ she asked her mother at the football game, pointing to the cadets, “to lead that?’’

On Monday, more than a decade after her pretend marches in the woods, Askew, now 20, led the freshmen Army cadets for 12 miles — the first African-American woman to hold the highest student position at the US Military Academy.

As the West Point corps of cadets first captain, the northern Virginia resident will not only be at the forefront of every academy event, but she will also set the class agenda and oversee the roughly 4,400 students.

“You’re selected for this role, that’s not the end of it,’’ said Askew, speaking Monday after she had finished overseeing the return of the freshmen cadets from their initial summer of training.

“That’s just the starting line, and it’s more so, ‘hey, what do you do with this role? What are you able to accomplish alongside your teammates?’ And I’m very, very fortunate to be around some awesome people,’’ she said.

It is a significant step for West Point. The larger Army has historically been at the forefront of military integration, but has yet to see more than 20 African-American women graduate in a single class.

“Simone looks like America,’’ said Pam Walter Locke, the first African-American woman to graduate from West Point and one of Simone’s mentors. She said she didn’t think she would see an African American woman hold the coveted position in her lifetime. “Everybody can see themselves in Simone.’’

“This is such a historic moment,’’ added Locke, who retired as an Army air defense artillery major in 1995.

The first captain position is often a herald of successful Army careers. Cadet Vincent K. Brooks held the title in 1980, becoming the first African-American to serve as West Point first captain, and he now is a four-star general commanding US forces in South Korea.

Cadet John W. Nicholson Jr. was first captain in 1982, and he also wears four stars today as the senior US and NATO commander in Afghanistan.

Few people are surprised that Askew, who graduated from Fairfax High School outside of Washington in 2014, earned the first captain position, which also serves as a liaison between the West Point student body and the military administration.

As a high school student, she spent summers volunteering at orphanages in the Dominican Republic, became school president and captain of the volleyball team, and started the school’s Black Student Union.

“This is a kid who did well academically, who did well athletically and also did well from a community standpoint,’’ said Christine Zanellato, who coached her as part of the volleyball team at Fairfax High School for three years. “It’s very hard to have all three.’’

Zanellato still has the list of the four nominations Askew earned as part of her application to West Point and the Naval Academy: three legislators, including Senator Tim Kaine, a Virginia Democrat, and the West Point superintendent.

“To achieve what she’s achieved, it takes thoughtful, long-term planning,’’ Zanellato said. “It’s not something that just happens, it’s something she worked for.’’

While she was initially drawn to the Naval Academy, Askew became set on West Point after watching a volleyball game at the school, drawn to the intensity and leadership she saw in the women on the court.

She missed her crowning as Fairfax High homecoming queen to attend a West Point recruiting event, but was there to crown her successor a year later, the faux diamond tiara hidden under her dress gray Army uniform hat.

“She would say she felt more like a homecoming queen being at the West Point weekend because she was achieving goals she wanted to achieve,’’ Pam Askew said of her daughter. “And that made her feel like a queen.’’

The accolades continued at West Point: a successful walk-on member of the West Point crew team, an Air Assault graduate and a record score in field training.

Colonel Diane Ryan, who also sponsored Simone Askew, said it became clear at the beginning of last year that she was going to be a competitive candidate.

“Some cadets that are really high performing, they just go about their own business,’’ said Ryan, of the department of behavioral sciences and leadership at West Point. “She is just a leader in every sense of the word, figuring out how she can connect people together and serve others.’’

Askew’s mother, who works to develop affordable housing, is white and is divorced from Simone Askew’s father, who is African-American. The mother said she is nervous about the pressure she knows her daughter will put on herself, aware of the spotlight she’s under at West Point.

“I look forward to the end of her term in this position where many say she was an amazing first captain, not just she was an amazing African-American female first captain,’’ she said.

Simone Askew is considering military intelligence work after she graduates in the spring.

The significance of Askew’s achievement has resonated with many black women who have graduated from West Point.

Locke broke the first barrier at West Point by becoming the first African-American woman to cross the academy graduation stage in 1980. The other African-American woman, Joy Dallas, was just a few steps behind.