The Russian Imperial Navy had a base at Liepaja (Libava) - perhaps this is the base your family history is referring to?
There is a town east of there called Durbe, though there are also other smaller towns nearby that begin with the letter D.
My experience with Lithuanian town names is that the Yiddish equivalents are often one or two syllables shorter than the modern names (for instance Yiddish Gruzd for modern Gruzdziai). So your one syllable town name that begins with a D could have a Latvian name of two or three syllables.
Lak/Lok/Liak/Lock and Kalon/Kolon in Zagare/Joniskis/Gruzdziai, Lithuania
Lak/Lok/Liak/Lock in Plunge/Telsiai in Lithuania
Rabinowitz in Papile, Lithuania and Riga, Latvia
Trisinsky/Trushinsky/Sturisky and Leybman in Dotnuva, Lithuania
Olitsky in Alytus, Suwalki, Poland/Lithuania
Gutman/Goodman in Czestochowa, Poland
Lavine/Lev/Lew in Trenton, New Jersey and Lida/Vilna gub., Belarus