Boeing has dealt with a legacy aileron buzz issue on the Super Hornet by modifying the wing with a saw tooth mod and "tripper strips" (visible at the aileron hinge line) hence my comment as to which feature you meant. The wing fence that you noticed is the most obvious of the changes to the G model and principal benefit is during high-g maneuvering, which is why the Citation doesn't need them. A byproduct was elimination of the perforated hinge fairing over the wing fold that was added during Super Hornet testing to address the infamous "wing drop". As why it is only on the G variant, Boeing offered to add it to the E/F production line, but the Navy opted not to adopt it so late in the production run. It will be interesting to see if the Australian Super Hornets have it as they will be plumbed for upgrade to G capability. Good question by the way.
Doesn't look like the first ones off the line for OZ have them. This photo was taken about a week ago in Auckland on their way home.
100713-N-5528G-758 PACIFIC OCEAN (July 13, 2010) An EA-18G Growler, assigned to the Vikings of Electronic Attack Squadron (VAQ) 129, performs the 200,000th trap on the flight deck of the aircraft carrier USS Carl Vinson (CVN 70). Carl Vinson is underway conducting fleet replacement squadron carrier qualification operations off the coast of Southern California. (US Navy photo by Mass Communication Specialist 3rd Class Patrick Green/Released)
*throws up some tea leaves* Well, let's see. Hmm. Naah, that can't be right. *scatters some chicken bones* Well, that's certainly odd. Huh. Aw, heck.
101021-N-6632S-013 ATLANTIC OCEAN (Oct. 21, 2010) An EA-18G Growler assigned to Electronic Attack Squadron (VAQ) 141 launches from the aircraft carrier USS George H.W. Bush (CVN 77). George H.W. Bush is underway conducting a Tailored Ship's Training Availability and Final Evaluation Problem. (U.S. Navy photo by Mass Communication Specialist Seaman Kevin J. Steinberg/Released)
101023-N-3737T-426 ATLANTIC OCEAN (Oct. 23, 2010) An EA-18G Growler assigned to Electronic Attack Squadron (VAQ) 141 lands during flight operations aboard the aircraft carrier USS George H.W. Bush (CVN 77). George H.W. Bush is underway conducting training operations in the Atlantic Ocean. (U.S. Navy photo by Mass Communication Specialist 2nd Class Eric Tretter/Released)
110127-N-8913A-001 ATLANTIC OCEAN (Jan. 27, 2011) Sailors assigned to Electronic Attack Squadron (VAQ) 141 perform an inspection on an EA-18G Growler in the hangar bay aboard the aircraft carrier USS George H.W. Bush (CVN 77). George H.W. Bush is underway conducting composite training unit exercise. (U.S. Navy photo by Mass Communication Specialist 3rd Class Leonard Adams/Released)
When Hornets Growl (Air & Space magazine, March 2011) Here's one for the Growler flight crews, support folks, fans, and EW nerds all over (I fall under two out of four of those things): http://www.airspacemag.com/military-aviation/When-Hornets-Growl.html
ECMO has global SA.....he needs no JHMCS. On a side note, I flew a lot 16 the other day with JHMCS.......I plugged my helmet in and nothing happened...sad
110615-F-MJ568-059 JOINT PACIFIC ALASKA RANGE COMPLEX, Alaska (June 15, 2011) An EA-18G Growler assigned to Air Test and Evaluation Squadron (VX) 9 refuels from a Marine Corps KC-130 Hercules, not pictured, assigned to Marine Aerial Refueler Transport Squadron (VMGR) 452 during exercise Northern Edge 2011. (U.S. Air Force photo by Staff Sgt. Amanda Dick/Released)