The agency will assist the charity in developing and executing its LifeWorks programme, which helps veterans return to the workplace after military service. The charity will celebrate its 100th anniversary in 2019.
Pagefield said work would soon begin on the contract, leading up to a parliamentary reception later this month, which will be used as a launch pad to engage with government, politicians, media and business.
The agency will provide both PR and stakeholder support for the launch event and comms programme.
RBLI is a national charity providing treatment, training and support to the armed forces, including care and employment for people disadvantaged by disability, health conditions or social welfare needs. In the year to 31 March 2015 it had income of £21.5m and 373 staff, its accounts filed at the Charity Commission show.
Oliver Foster, managing partner at Pagefield, said: "RBLI is one of the UK’s most interesting charities and its important work deserves to be more widely known. The charity has retained its core and original purpose of supporting ex-servicemen, but it has also successfully developed ways of engaging other disadvantaged people in employment."