The Northrop Grumman E-2D Hawkeye is a bit of an unsung hero of the carrier air wing. It's not fast or stealthy but is key to most missions of the wing. Each CVW is assigned one airborne command and control squadron with just five E-2Ds; an E-2D is generally aloft during operations.
The airframe itself is a '50s design. The initial Grumman W2F-1 (E-2A) first flew in 1960. The E-2As brought great capability to the fleet but suffered problems mainly due to problems in keeping the electronics cool. The E-2A was succeeded by the E-2B and then the E-2C and some export sales were made as well. Details can be found in the Wikipedia article.
The E-2D first flew in 2007 and has almost completely replaced earlier E-2s in the air wings. It has a crew of five: Two pilots up front and three radar officers in the rear. Its endurance is six hours; in a move to extend endurance, newly built E-2Ds are coming from the factory with aerial refueling probes and earlier E-2Ds are being refitted with probes to allowed extended time on station -- see photo.
https://en.wikipedia.org/wiki/Northr...an_E-2_Hawkeye