A lokacin yakin duniya na biyu, Grumman ya zama sananne ne ga "Cats", jirgin saman yaki na Navy, F4F Wildcat da F6F Hellcat, da kuma Grumman F7F Tigercat da Grumman F8F Bearcat (wanda ba a san shi ba a lokacin yakin duniya na biyu), da kuma TBF Avenger. Grumman ya kasance na 22 a cikin kamfanonin Amurka a cikin darajar kwangilar samar da yakin. Jirgin farko na Grumman shi ne F9F Panther; wanda aka sabunta shi F9F / F-9 Cougar, da kuma sanannun Tiger F-11 a cikin shekarun 1950. Babban nasarar da kamfanin ya samu bayan yakin ya zo ne a shekarun 1960 tare da A-6 Intruder da Hawke E-2 da kuma a cikin shekarun 1970 tare da EA-6B Prowlerw da Grumman F-14 Bearcat (wanda ba a san shi ba a lokacin yakin duniya na biyu), yayin da aka yi amfani da shi a cikin fina-finai da fina-finai da yawa a kan jirgin sama na Amurka, kamar yadda aka yi amfani da shi a cikin fina-finai da fina-finai na Marine Aircraft Tom W
Yaƙin Duniya na II