Question: Who is Donald Pierce an enemy of?
Context: Robert Boyd Holbrook (born September 1, 1981) is an American actor and fashion model.  He has appeared in films such as "Milk", "Out of the Furnace", "Run All Night", "A Walk Among the Tombstones", and "Gone Girl", and starred as DEA Agent Steve Murphy in the Netflix series "Narcos".  In 2012, he starred in the series Hatfields & McCoys (miniseries) as "Cap" Hatfield, and in 2017, he portrayed villain Donald Pierce in "Logan". "Football, Feminism and You" is the sixth episode of the first season of the American comedy television series "Community".  It aired in the United States on NBC on October 22, 2009.  The episode centers on Troy (Donald Glover) and his career playing football at Greendale Community College, while the B storyline concerns Britta (Gillian Jacobs) and her difficulty befriending other women.  Pierce (Chevy Chase) works with Dean Pelton (Jim Rash) to create the school's mascot. The United States 32nd Infantry Division was formed from Army National Guard units from Wisconsin and Michigan and fought primarily during World War I and World War II.  With roots as the Iron Brigade in the American Civil War, the division's ancestral units came to be referred to as the "Iron Jaw Division".  During tough combat in France in World War I, it soon acquired from the French the nickname "Les Terribles", referring to its fortitude in advancing over terrain others could not.  It was the first allied division to pierce the German Hindenburg Line of defense, and the 32nd then adopted its shoulder patch; a line shot through with a red arrow, to signify its tenacity in piercing the enemy line.  It then became known as the "Red Arrow Division". A catapulta was a Roman machine for throwing arrows and javelins, 12 ft or 15 ft long, at the enemy.  The name comes from the Greek ("katapeltes"), because it could pierce or 'go through' ("kata") a shield ("pelta").  The design was probably inherited, along with the ballista, from Greek armies. Rabbit's Kin is a "Merrie Melodies" animated short released on November 15, 1952.  It was directed by Robert McKimson and written by Tedd Pierce.  The cartoon was animated by Charles McKimson, Herman Cohen, Rod Scribner, Phil DeLara and Keith Darling.  The music was scored by Carl Stalling while the layouts and backgrounds were done by Robert Givens and Richard H. Thomas, respectively.  Mel Blanc performs the voice of Bugs Bunny and Shorty Rabbit, while Stan Freberg voiced Bugs' new enemy Pete Puma, doing an imitation of the character Frank Fontaine introduced on The Jack Benny Show named John L. C. Silvoney, and later performed on The Jackie Gleason Show as Crazy Guggenheim.  The title is a play on "rabbit skin", but is also a literal term in that Bugs is caring for a "kin", here, another rabbit. "Advanced Criminal Law" is the fifth episode of the first season of the American comedy television series "Community".  It aired in the United States on NBC on October 15, 2009.  The episode centers on three main story lines.  First, Jeff (Joel McHale) defends Britta (Gillian Jacobs) when she is accused of cheating on a Spanish test.  Meanwhile, Pierce (Chevy Chase) tries to help Annie (Alison Brie) write Greendale a school song.  Finally, Troy (Donald Glover) and Abed (Danny Pudi) test each other's gullibility. Logan is a 2017 American epic neo-western superhero drama film produced by Marvel Entertainment, TSG Entertainment, and The Donners' Company, and distributed by 20th Century Fox.  It is the tenth installment in the "X-Men" film series, as well as the third Wolverine solo film following "" (2009) and "The Wolverine" (2013).  The film, which takes inspiration from the "Old Man Logan" comic-book series by Mark Millar and Steve McNiven, follows an aged Wolverine defending his daughter Laura Kinney from the villainous Reavers led by Zander Rice and Donald Pierce. Donald Pierce is a fictional supervillain appearing in American comic books published by Marvel Comics.  The character is depicted as a cyborg and is commonly an enemy of the X-Men. The Reavers are a fictional team of criminal cyborgs appearing in American comic books published by Marvel Comics.  The most significant team of Reavers were dedicated to the destruction of the mutant X-Men, and a number of them especially wanted to take revenge on one particular X-Man, Wolverine.  The name was originally used by a gang of Australian cyborgs.  The name later referred to a group under the leadership of Donald Pierce, consisting of the three survivors from the original Reavers along with other cyborgs. Cobra is the name of a number of different fictional characters appearing in American comic books published by Marvel Comics.  The most well known "Cobra" is Klaus Voorhees, now known as "King Cobra".  He first appeared in "Journey into Mystery" #98 (Nov 1963) created by writer Stan Lee and artist Don Heck.  His nephew, Piet Voorhees, took over the name "Cobra" and first appeared in "White Tiger" #1 (Jan 2007) in a story written by Tamora Pierce and drawn by Timothy Liebe.  Marvel has also used the moniker "Cobra" for two World War II Nazi villains and also a mercenary enemy of Moon Knight.
Answer: enemy of the X-Men.