Vaughn Armstrong Vaughn Dale Armstrong , Jr . is a veteran " Star Trek " actor who is noted for portraying twelve separate characters in twenty - eight episodes over four separate series . Armstrong is one of only five actors to play seven or more different characters in the " Star Trek " franchise ( the others being Jeffrey Combs , Randy Oglesby , J . G . Hertzler , and Thomas Kopache ) . His characters include a Human , a mirror universe Human , a Romulan , a Borg / former Borg , a Vidiian , a Kreetassan , a Hirogen , two Cardassian s , and three Klingon s . However , he is probably best known for his recurring role as Admiral Maxwell Forrest in the series . He appeared in both the second , and penultimate episode of . He has the distinction of playing the first male Klingon on , apart from Worf . He was one of many actors ( including Jeffrey Combs and William O . Campbell ) who auditioned for the role of William T . Riker on that same series . Armstrong ' s talents also extend into the musical arena . He has mastered the , using a " banjo " - style ukulele ( commonly known as a ) he made himself . With it he entertains audiences with Civil War - era songs and roots music , leading into the blues music he plays with others . His " Trek " - related blues songs are popular at convention appearances . His folk song band , The Enterprise Blues Band , includes fellow " Trek " actors Richard Herd ( Owen Paris ) , Steve Rankin ( Colonel Green and other roles ) , and Casey Biggs ( Damar ) . Armstrong does the lead vocals in the band and plays also harp ( harmonica ) . He has joked on stage during conventions that he is the innovator of Klingon " gutbucket " music and Andorian blues . As an actor away from " Star Trek " , Armstrong has had a thirty - plus - year career in roles with many " Trek " alumni . On film Armstrong cut his teeth in 1977 ' s " Roger & Harry : The Mitera Target " with Robert DoQui , Richard Lynch , and Harris Yulin . 1978 saw Armstrong in the aviation drama , " The Winds of Kitty Hawk " , sharing the screen with Robin Gammell , John Hoyt and Eugene Roche . Nearly a decade later , Armstrong would work with fellow multiple Trek star Glenn Morshower in 1984 ' s " The Philadelphia Experiment " . Another six years passed and Armstrong worked with a number of " Trek " actors in " Family of Spies " joining alumni Wren T . Brown , Jeffrey Alan Chandler , Gordon Clapp , Paul Collins , William Frankfather , Spencer Garrett , Ken Jenkins , Wyatt Knight , Boris Lee Krutonog , and Aaron Lustig . A year later , Armstrong re - joined Clapp in the telefilm " Mission of the Shark : The Saga of the U . S . S . Indianapolis " ; they were accompanied by Bob Gunton , Jeffrey Nordling , and Cary - Hiroyuki Tagawa . In 1994 , Armstrong re - teamed with Aaron Lustig and Harris Yulin in the Tom Clancy novel " cum " film , " Clear & Present Danger " with Reg E . Cathey , Raymond Cruz , Kamala Dawson , Elizabeth Dennehy , Ellen Geer , Michael Jace , and John Putch . 1995 ' s computer thriller " The Net " reunited Armstrong with Wren Brown , and they worked with Juan García and Dan Shor . That same year , Armstrong teamed up again with Gammell , Lustig , and Yulin in the telefilm " If These walls Could Talk " with Jack Kehler . The film was executive - produced by Whoopi Goldberg . Armstrong was joined by DS9 co - star and fellow Enterprise Blues Band member Casey Biggs in " 2 Voices " with Nicolas Surovy and in 1998 , Armstrong worked with co - star and another Enterprise Blues Band member Richard Herd in " I Married a Monster " . The most recent film in which Armstrong appeared was " Finding Amanda " , in which he was joined by Patrick Fischler , Anthony Holiday , and Daniel Roebuck . Armstrong has also been productive on television . Armstrong appeared on " Lou Grant " with " Voyager " colleague Keene Curtis . He made his way to " Wonder Woman " with Henry Gibson and Dennis Madalone , who later served as Armstrong ' s stunt double in " Heart of Glory " . Following this fantasy turn , Armstrong guested on on " A Man Called Sloane " with Alex Henteloff and Monte Markham . Armstrong joined Anthony De Longis and Morgan Woodward on " Matt Houston " . Armstrong played a cop in two episodes of " Simon & Simon " with Jonathan Banks and Lance LeGault . Armstrong had a role in the television thriller series " Alfred Hitchcock Presents " with Rif Hutton . On " Scarecrow & Mrs . King " , Armstrong worked with future DS9 co - star Nana Visitor . These roles preceded Armstrong ' s role in . There was work long after that and before he turned up on DS9 , " Voyager " , and " Enterprise " . Armstrong ' s role following " Heart of Glory " was on " Cheers " , starring Kirstie Alley , Kelsey Grammer , and Bebe Neuwirth . Armstrong continued in the comedy vein landing up on " Seinfeld " with Jason Alexander , Corbin Bernsen , Peter Parros , and Marty Rackham . Armstrong later appeared on the anthology series " F . B . I . The Untold Stories " , joining Edward Laurence Albert and Adrienne Barbeau . Armstrong was then seen on the comedy - western " The Adventures of Brisco County Jr . " with Peter Dennis . Armstrong worked with DS9 and TNG guest stars Daphne Ashbrook and Katherine Moffat on the cop series " One West Waikiki " . Armstrong reunited with Kelsey Grammer on " Frasier " with Marnie Mosiman . Armstrong then returned to his sci - fi roots on " Babylon 5 " , working with Andreas Katsulas , Bill Mumy , Majel Barrett , Marshall Teague , and Ed Trotta . Armstrong was seen twice on " Melrose Place " with Carlos LaCamara and with Leland Crooke , Margot Rose , and Michael Shamus Wiles . Next was " Baywatch Nights " with Christopher Michael . Armstrong reunited with Jack Kehler on the court drama " Murder One " alongside Barbara Bosson , Don R . McManus , and Rick Worthy . Continuing the fantasy trend , Armstrong joined " Voyager " co - star Jeri Ryan on " Dark Skies " with David Carpenter and Charley Lang . Armstrong re - teamed with Robin Gammell and Glenn Morshower on the premiere of " C - 16 : FBI " , also starring Michael Cavanaugh and Zach Grenier and guest - starring Melinda Culea and Stanley Kamel . Armstrong found himself once again working with Gordon Clapp and Aaron Lustig on Clapp ' s starring role series , " NYPD Blue " , also starring Sharon Lawrence . Law enforcement was still in the cards for Armstrong with a turn on " Profiler " starring Dennis Christopher . A role on " Pensacola : Wings of Gold " took Armstrong to the skies with Randy Mulkey . Armstrong then played another cop on " Buffy the Vampire Slayer " directed by James Whitmore , Jr . . Because of his work on " Simon & Simon " , producer Philip De Guere , Jr . brought Armstrong over to the military - legal series " JAG " with Bill Bolender , Blake Lindsley , Benjamin Brown , Paul Collins , and Mark Metcalf . Armstrong joined fellow Romulan player Alan Scarfe on his series " Seven Days " with Holmes R . Osborne . The next role with a " Trek " alum was " The Beast " with Lilyan Chauvin . Another run with Crooke was on " Philly " with Scott Alan Smith . Then came " The Guardian " starring Raphael Sbarge with John de Lancie . Reunions were again a theme on the premiere of " Mister Sterling " , where Armstrong ended up again with Bob Gunton , Stanley Kamel , and Harris Yulin , and along for the episode were Art Chudabala , David Doty , and fellow multiple " Trek " actor Randy Oglesby . " Mister Sterling " was short - lived , as was the next series on which Armstrong guest - starred , " Smith " , starring Virginia Madsen . Armstrong ' s most recent television roles were on the ' 60s period comedy - drama " Mad Men " with fellow " Voyager " and " Enterprise " actor Mark Moses ; on " Desperate Housewives " with Teri Hatcher , Vanessa Williams , Brenda Strong , Kevin Rahm , Dakin Matthews , and Aaron Lustig ; and on " CSI : Crime Scene Investigation " with fellow " Voyager " actor Wallace Langham . He has also appeared in " Criminal Minds " , " Law & Order : LA " , and " Desperate Housewives . " Appearances . In as Maxwell Forrest :