UFC officials made the announcement on Monday.
Nunes (8-3) made her UFC debut on Aug. 3 at UFC 163 against Sheila Gaff. She defeated Gaff by TKO in the first round.
Randamie (4-2) also won her UFC debut on July 27 on the UFC on Fox 8 fight card by defeating veteran Julie Kedzie by split decision.
Both women are ranked in the top ten in the UFC rankings.
UFC: Fight for the Troops 3 takes place on Nov. 6 at Fort Campbell, Ky. It is headlined by a middleweight bout between former light heavyweight champion Lyoto Machida and Tim Kennedy. The fight will be Machida’s 185-pound debut.