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Sophia Yelenick holds her nephew Ronin Attardi, 4, on her shoulders as they watch the The Colorado Emerald Society Pipe Band perform during the annual Red Rocks 9/11 Memorial Stair Climb in Morrison on Sept. 11, 2024.

Hundreds of firefighters, their families and supporters pause during a moment of silence before taking part in the annual Red Rocks 9/11 Memorial Stair Climb in Morrison on Sept. 11, 2024.

Mark Manwell, volunteer with the Honor Bell Foundation, left, uses his mace to give orders to toll the Honor Bell during the opening ceremony for the annual Red Rocks 9/11 Memorial Stair Climb in Morrison on Sept. 11, 2024.

South Metro Fire Rescue Captain Josh Schmidt, left, and firefighter Rosie Said, help place a large American flag between their ladder truck Tower 35 and West Metro鈥檚 Tower 8 during the annual Red Rocks 9/11 Memorial Stair Climb in Morrison on Sept. 11, 2024.

Evergreen firefighters pause with others during a moment of silence before taking part in the annual Red Rocks 9/11 Memorial Stair Climb in Morrison on Sept. 11, 2024. (Photo by Helen H. Richardson/The Denver Post)

Warren Tech firefighter student Kayleb Jones, 16 pauses with others during a moment before taking part in the annual Red Rocks 9/11 Memorial Stair Climb in Morrison, Co on Sept. 11, 2024.

Elbert Fire Rescue firefighter Misha Papak, center, gets emotional during a moment of silence with fellow firefighters Kyrin Rodewald, of Peyton Fire, left, and Alyssa Rosenberg, of Franktown Fire, right, before taking part in the annual Red Rocks 9/11 Memorial Stair Climb in Morrison on Sept. 11, 2024.

Badges with names and photos of firefighters who lost their lives in the 9/11 terror attacks are given to people taking part in the annual Red Rocks 9/11 Memorial Stair Climb in Morrison on Sept. 11, 2024.

Hundreds of firefighters, their families and supporters begin the annual Red Rocks 9/11 Memorial Stair Climb in Morrison on Sept. 11, 2024.

Arvada Firefighter Sawyer Rone begins the annual Red Rocks 9/11 Memorial Stair Climb in Morrison on Sept. 11, 2024.

Firefighters hike up the steep steps of Red Rocks as they take part in the annual Red Rocks 9/11 Memorial Stair Climb in Morrison on Sept. 11, 2024.

South Metro Fire Rescue engineer David Freyta makes his way up the steep steps during the annual Red Rocks 9/11 Memorial Stair Climb in Morrison, Co on Sept. 11, 2024.

Firefighters with the CO-DFPC wildland fire unit carry their saws as they take part in the annual Red Rocks 9/11 Memorial Stair Climb in Morrison on Sept. 11, 2024.

Fairmount Fire firefighter Zack Shocklee hikes up the steep steps of Red Rocks with his son Hank, 3, on his back as they take part in the annual Red Rocks 9/11 Memorial Stair Climb in Morrison on Sept. 11, 2024.

Rock Canyon High School Fire sciences student Josh Kelleher sits down to cool off for a moment in the shade as he takes part in the annual Red Rocks 9/11 Memorial Stair Climb in Morrison on Sept. 11, 2024.

Front Range Fire Rescue Firefighters Eli Kershaw, left, and Miguel Hernandez, right, take a break from wearing their face masks and doing the stair climb on compressed air during the annual Red Rocks 9/11 Memorial Stair Climb in Morrison, Co on Sept. 11, 2024.

Greater Eagle firefighters Phil Marston, left, and Tanner Stoen, right, take a break in the shade to cool off while taking part in the annual Red Rocks 9/11 Memorial Stair Climb in Morrison on Sept. 11, 2024.

Elk Creek cadet firefighter Elizabeth Viurquez, 18, takes a quick break in the shade to cool off while taking part in the annual Red Rocks 9/11 Memorial Stair Climb in Morrison on Sept. 11, 2024.

Firefighters hold onto one another as they near the top of the stairs while taking part in the annual Red Rocks 9/11 Memorial Stair Climb in Morrison on Sept. 11, 2024. (Photo by Helen H. Richardson/The Denver Post)