Gabrielle Giffords: How did she mark shooting anniversary? With a dive.

Gabrielle Giffords marked the three-year anniversary of an attack that left her severely wounded and forced her to resign from Congress by skydiving Wednesday in a feat that highlights her ongoing recovery after having to learn how to walk and talk again.

Across the city, others gathered for bell-ringing and flag-raising ceremonies to remember the six killed and 13 injured, including Giffords, on Jan. 8, 2011, as the former Arizona congresswoman met with constituents outside a grocery store.

Giffords waved and blew kisses to a crowd at a skydiving site between Phoenix and Tucson after successfully landing without injury.

"Gabby landed beautifully. Happy she's safe. So proud of her bravery," Giffords' husband, former astronaut Mark Kelly, wrote on his Twitter account after the tandem jump with his wife strapped to a professional skydiver.

Jimmy Hatch, a former Navy SEAL who accompanied Giffords along with others, said the group held hands and formed a circle shortly after exiting the aircraft, then made a line with Giffords in the middle.

"She was the least nervous person on the plane," Hatch said, calling Giffords a "rock star" for making the jump on such an emotional day.

"They did a little moment of silence at the drop zone," he said. "The emotion was really heavy. Then she smiled and said, 'Let's go.'"

Vice President Joe Biden's office said he called Giffords on Wednesday to wish her good luck.

"Gabby's courage & determination has been absolutely inspirational," Biden wrote on his office's Twitter account.

Giffords' jump will be broadcast Thursday on NBC's "Today" show.

In Tucson, about 100 residents attended a ceremony Wednesday morning outside the University of Arizona Medical Center, where the injured were treated. A bell was rung once for each victim as the Rev. Joe Fitzgerald spoke to the crowd.

"Today, we gather to remember the tragic day three years ago when our community was deeply wounded," he said.

Other ceremonies and moments of silence took place across the city.

"I think the commemorations are, in large part, recognition of our community's collective care and compassion and grit to go on," Tucson Mayor Jonathan Rothschild said.

Pam Simon, 66, who was a Giffords aide at the time of the attack and suffered a gunshot wound to the chest, reflected on the shooting with crisp memories, but also a positive outlook.

"When we stop on an anniversary to really reflect, sometimes it opens the wounds a little bit," she said. "But it's also gratifying in a way to see the community come out again and remember."

Meanwhile, Giffords, who was shot in the head, has become a leader of Americans for Responsible Solutions, a national organization she founded with her husband to rival the powerful pro-gun lobby.

The group has struggled to bring about major change in its first year of existence, but the couple is confident they've laid the groundwork for success in future election cycles.

"The legacy of any day where there's a mass shooting and loss of life is, I think, a chance to reflect on who these people were and what they did, particularly the people who died," Kelly said in an interview with The Associated Press on the eve of the anniversary. "But it's also a chance to look forward and see how we can make changes and reduce the numbers of instances like this that we have."

Giffords, an Arizona Democrat, and Kelly formed their organization just weeks after the massacre in Newtown, Conn.

Since then, Congress has done nothing to tighten the nation's gun laws. Some states, including Colorado and Delaware, pushed ahead with their own gun-control measures, while others like Arizona, Giffords' home state, moved in the opposite direction, passing a law that requires municipalities to sell weapons surrendered at buyback programs instead of destroying them.

Kelly said his group raised more than $11 million between January 2013 and July 2013.

"So we're going to have the resources to be effective in the next election cycle in 2014," he said.

In an opinion piece for The New York Times on Wednesday, Giffords wrote about her struggles to recover, calling it "gritty, painful, frustrating work."

"I had planned to spend my 40s continuing my public service and starting a family," she wrote. "Instead, I've spent the past three years learning how to talk again, how to walk again."

Jared Lee Loughner was sentenced in November 2012 to seven consecutive life sentences, plus 140 years, after he pleaded guilty to 19 federal charges in the shooting.