Service personnel are aiming to cycle nearly 3,500 miles - the distance from RAF Wittering to Camp Bastion - on a static bike to raise money.
Cpl Kalvin Williams, of 2 Mechanical Transport Squadron at RAF Wittering, is riding the distance with his colleagues in three stages.
The first stage of 708 miles took place earlier this year and the second stage of 1,342 miles took place on October 11 - when Cpl Williams and 12 colleagues rode the mammoth distance in just 12 hours.
He will complete the task and cycle the remaining 1,367 miles when he deploys to Afghanistan at the end of November.
Cpl Williams organised the huge task with the aim of raising £1,000 for the Katie Piper Foundation, which was set up to help people with severe burns.
The foundation was set up by Katie herself after she suffered severe facial disfigurement in an acid attack.
Thanks to sponsorship from his colleagues, Cpl Williams is already at £800.
Cpl Williams, who has also raised money in the past for Help for Heroes, said: “In my line of work I’ve seen troops go through some life changing experiences and find the inner fight and spirit to carry on.
“When I read about what Katie went through, she found the same inner fight and spirit and it’s what caught my eye.
“So I thought I would try to help raise funds for The Katie Piper Foundation to help other burns survivors.”
Head of fundraising at The Katie Piper Foundation Carol Borwick said: “We’re so grateful to Cpl Williams and his fellow 2 Mechanical Transport Squadron colleagues for undertaking these challenges on our behalf and thanks to all who have supported them so far.
“The money raised will help us make a positive difference to burns survivors.”
To donate to Cpl Williams and his team, visit www.justgiving.com/Kalvin-Williams