Passage: During World War II, Grumman became known for its "Cats", Navy fighter aircraft, F4F Wildcat and F6F Hellcat, and the less well known Grumman F7F Tigercat and Grumman F8F Bearcat (neither of which saw combat during World War II), and for its torpedo bomber TBF Avenger. Grumman ranked 22nd among United States corporations in the value of wartime production contracts. Grumman's first jet aircraft was the F9F Panther; it was followed by the upgraded F9F/F-9 Cougar, and the less well known F-11 Tiger in the 1950s. The company's big postwar successes came in the 1960s with the A-6 Intruder and E-2 Hawkeye and in the 1970s with the Grumman EA-6B Prowler and F-14 Tomcat. Grumman products were prominent in the films The Final Countdown, Top Gun and numerous World War II naval and Marine Corps aviation films. The U.S. Navy still employs the Hawkeye as part of Carrier Air Wings on board aircraft carriers, while the U.S. Marine Corps, the last branch of service to fly the Prowler retired it on March 8, 2019.

Question: What famous war had new aircrafts on both sides?
World War II