No, it's not an RAAF Growler. It's a VAQ-129 "Vikings" aircraft with Aussie-inspired tail markings, symbolizing the squadron's role in training aircrew for the RAAF's forthcoming EA-18G force.
The first of two Growlers launches from NAS Whidbey Island in preparation for a fly-by with the last EA-6B in the Navy inventory. If you look closely, you can see the shock diamonds from the afterburners.
Banking away from the crowd, one of NAS Whidbey's two SAR helos prepares to land after a simulated rescue exercise in front of the crowd at the Prowler Sunset/Open House.
VAQ-138 "Yellow Jackets", NAS Whidbey Island, Washington. Boeing EA-18G Growler blasts away from runway 25 during the 2015 NASWI Open House and EA-6B Prowler Sundown celebration.
NAS Whidbey Island Search and Rescue Sikorsky MH-60S Knighthawk "Firewood 58" performs a SAR display prior to the final departure of the last EA-6B Prowler from active United States Navy service.
VQ-1 "World Watchers", NAS Whidbey Island, Washington. Lockheed EP-3E Aries II on, surprisingly, static display at the 2015 NAS Whidbey Island Open House and Grumman EA-6B Prowler retirement.
VAQ-134 "Garudas", NAS Whidbey Island, Washington. Grumman EA-6B Prowler, on static display the day prior to departing NAS Whidbey Island for its final resting place at Point Mugu, California. Thank you for your faithful service, Prowler!