Private Snafu is performing the tedious task of sorting boots. Driven to madness by boredom he is taken to visit his brothers Tarfu and Fubar by the gruff Technical Fairy, First Class, somewhat in the spirit of Ebenezer Scrooge and the Ghosts of Christmas. Brother Tarfu is tending to the every need of carrier pigeons, while brother Fubar is the unlucky dummy used in training attack dogs. After seeing his brothers' terrible jobs Private Snafu returns to work with gusto, exclaiming that his job is important.
The short contains a brief cameo by Bugs Bunny as Private Fubar seeks a hiding place from a pack of dogs.
Three Brothers briefly appears as a training video in the 2001 film Black Hawk Down.
Friedwald, Will and Jerry Beck. "The Warner Brothers Cartoons." Scarecrow Press Inc., Metuchen, N.J., 1981. ISBN 0-8108-1396-3.