In its first partnership, Landmarc Support Services will raise funds for the RNLI's Crew Training Campaign.
The RNLI and Landmarc Support Services have agreed a two-year fundraising partnership of at least £50,000 per year that will benefit the charity's Crew Training Campaign.
An initial donation of £5,000 has been made by the company. The rest of the money will be raised by its staff.
The RNLI Crew Training Campaign is designed to raise £10m over five years to support the training of RNLI volunteers. For £1,300, a new volunteer can be trained to become part of an all-weather lifeboat, and £100 buys a set of training manuals for a lifeboat crew.
Andy Whyte, crew training campaign manager for the RNLI, said: "Crew training is the vital ingredient that turns a raw RNLI recruit into an efficient lifeboat volunteer, but it's also a vital part of the team-building needed to create a top-class lifeboat crew.
"Those principles of working and learning together will help Landmarc staff tackle the challenge of raising at least £50,000 over the next two years."
Landmarc is responsible for the management, operation and development of the Ministry of Defence army training estates, which cover more than 120 sites across the country.
Brian Talbot, project director at Landmarc, said: "Many people are unaware of the huge risks brave RNLI volunteers take to save the lives of others and that training is absolutely essential to ensure their own safety.
We are delighted that we are able to support such a vitally important campaign."
Karen Priest, communications manager for Landmarc, said she thought the fundraising initiatives would promote positive relationships and teamwork.
"A lot of our staff work on army training estates in rural areas," she said. "We were looking for ways of building bridges between Landmarc and the rural communities in which they work - by holding car boot sales or open days, for example."
She said Landmarc had "a lot of synergy" with the RNLI because its core business was to support and enable military training, and many of its employees live in coastal areas in places such as Pembrokeshire, Scotland and Devon and are RNLI volunteers.
The charity was chosen by ballot after being nominated by Landmarc maintenance technician Kevin McBay, who is an RNLI volunteer crew member off the east coast of Scotland.
Clare Kavanagh, corporate fundraising manager at RNLI, said that Landmarc is "a good organisation for releasing its staff to work on the lifeboats as and when necessary".
Kavanagh said the £100,000 would make an "incredible difference" to the charity despite the fact that it takes £325,000 a day to run the RNLI.
The RNLI's 'Train one, save many' crew training campaign includes a range of fundraising appeals taking place around Britain and was launched in March
Weekly training for both new and experienced crew members takes place at the RNLI's 233 lifeboat stations
Landmarc is responsible for the management, operation and development of the MOD's army training estates
The charity was chosen by ballot and nominated by a Landmarc technician who is also an RNLI volunteer crew member.