Nine lives, 10 years later

The skeptic who was there

April Gallop was in the Pentagon with her son, Elisha, on Sept. 11, 2001. (Bonnie Jo Mount/Post)

NINTH IN A SERIES | She was working at the Pentagon on Sept. 11, 2001, the day that things stopped making sense.

Living with ‘if only’

Rui Zheng lost her parents September 11, 2001. (Photo by Bonnie Jo Mount/The Washington Post)

EIGHTH IN A SERIES | A daughter’s small, considerate choice has a profound, unknowable consequence.

The wounded man

(Bonnie Jo Mount)

SEVENTH IN A SERIES | Since Sept. 11, 2001, Don Brennan, a Pentagon police officer, has been unable to forget the wounded man he tried to help.

After loss, working to fill the void

VANCOUVER, WA - AUGUST 28:Floyd Rasmussen lost his wife, Rhonda, during the attack on the Pentagon on September 11, 2001 Floyd later married Brenda, who bears a strong resemblance to Rhonda. (Photo by Bonnie Jo Mount/The Washington Post)

SIXTH IN A SERIES | After Floyd Rasmussen lost his wife Rhonda at the Pentagon on Sept. 11, 2001, he looked for a way to fill the void and ended up finding his current wife, Brenda.

Still feeling at home up in the sky

ARLINGTON, VA - AUGUST 15: Dannye Ivey tried to change her schedule but was not able to swap with anyone. Had she swapped she would have been on American Flight 77 -- the plane that crashed into the Pentagon on Sept. 11, 2001. (Photo by Bonnie Jo Mount/The Washington Post)

FIFTH IN A SERIES | Flight attendant Dannye Drake-Ivey was supposed to fly on Sept. 11, 2001. Now, 10 years after the attacks, she still lives in the sky.

After 9/11, security guard on high alert

STERLING, VA - JULY 28: Chris Steigherr served in the Marines and is now a security guard. (Photo by Bonnie Jo Mount/The Washington Post)

FOURTH IN A SERIES | Chris Stegherr is one of the security guards who was hired after the attacks of Sept. 11, 2001. More than a million guards — double the number in the nation’s workforce a decade ago — are patrolling public spaces.

Brought together by catastrophe

ARLINGTON, VA - AUGUST 25: Heinz and Nora Linderman met after the attack on the Pentagon on Sept. 11, 2001.They were married in the Pentagon chapel. (Photo by Bonnie Jo Mount/The Washington Post)

THIRD IN A SERIES | He survived the Sept. 11, 2001 attack on the Pentagon. He never imagined that day of tragedy could be responsible for bringing to him the love of his life.

Twin misses his other half

SILVER SPRING, MD - AUGUST 21: Art Powell lost his twin brother, Scott, at the Pentagon on Sept. 11, 2001. (Photo by Bonnie Jo Mount/The Washington Post)

SECOND IN A SERIES | Inseparable from his twin for 35 years, one man learns how to fill the hole in his life left after the death of his brother in the attack on the Pentagon.

Trying to find the new normal

CLOVIS, CA - JULY 23: Shari Tolbert lost her husband Vince Tolbert on Sept. 11, 2001. He was killed at the Pentagon. (Photo by Bonnie Jo Mount/The Washington Post)

FIRST IN A SERIES | A wife missing her husband. Children missing their father. They are the survivors of Lt. Cmdr. Otis Vincent Tolbert. And Sept. 11 has defined everything since.