The son of a former Irish Guardsman has scaled Pen y Fan, the highest peak in the Brecon Beacons National Park, for the 365th time in the space of a year.
Des Lally was joined by his 76-year-old father and other supporters who formed a Guard of Honour and cheered as he reached the top of the mountain on Saturday.
They were also treated to a fanfare from the Band of the Royal Welch Fusiliers.
Speaking at the summit, Mr Lally said:
"Today is the end of a long year, I've been coming up Pen y Fan 365 times in 365 days for Help for Heroes and Cancer Research UK."
He added: "It's been really humbling - not only for people who have donated, but the people who have liked and shared it.
Mr Lally went on to say: "It's been a massive journey and we've all been on it - it's not just me."
Saturday’s climb was the first time up the mountain for Des Lally Senior, who previously served with the Irish Guards.
The veteran, who has had treatment for cancer and has a heart condition, served on operations around the world for 26 years before retiring.
During the last year, his son Des has walked the route in gale force conditions and snow, and had to suspend his challenge for 10 days in the summer after suffering from heat exhaustion.
Mr Lally has often scaled the peak multiple times in one day, and on Friday he did the climb three times in 24 hours.
So far he has raised more than £50,000 for the charities Help for Heroes and Cancer Research UK.