The IVF is a Red Dead Redemption posse.
About the posse
The IVF (Irish Volunteer Force, Óglaigh na hÉireann), in real life, was an armed force formed in Ireland in 1913 in order to get Home Rule in the country, and to free the country of it's foreign oppression.
Formed on May 18th 2010, we had a lot of good games together and our members were loyal and willing, but after a long hiatus we unofficially disbanded circa 2011 as most members moved on; either they stopped playing Red Dead or we lost contact with them. We will be returning for GTA V under the Crew "B-Battalion".