The image stretched hundreds of feet high over the Okanogan highlands, based on photographs shared on social media.
Lt. Cmdr. Leslie Hubbell, a Navy spokeswoman, called the incident "absolutely unacceptable," saying it holds no training value and is under investigation.
The unit involved, Electronic Attack Squadron 130, flies a two-person variant of the F/A-18 Super Hornet and specializes in electronic warfare. The aircrew responsible has not been identified.
"We will not tolerate this behavior," Hubbell said. "This is not indicative of the overall population of our folks."
The Defense Department has placed heightened emphasis on sexual harassment and sexual assault in the ranks. And while it's not immediately clear what this investigation will yield, it's evident that the Navy is taking it very seriously.
This is not the first time a military pilot has drawn similar images. As the Drive pointed out, a Royal Air Force jet drew what appeared to be a penis in the sky over Scotland in 2014. The RAF later concluded the suggestive smoke trails were caused by a pilot circling in a holding pattern while waiting to land.
The Blue Angels' commanding officer at the time, Navy Capt. Gregory McWherter, was reprimanded for failing to stop sexual harassment and condoning pornography and homophobia in the workplace. Investigators also cited his call sign, "Stiffy."
"This Commanding Officer witnessed, accepted, and encouraged behavior that, while juvenile and sophomoric in the beginning, ultimately and in the aggregate, became destructive, toxic and hostile," the Navy's report said. Under his command, the Blue Angels environment "ran counter to established Navy standards and the Uniform Code of Military Justice, and dramatically weakened good order and discipline."
It's unclear what fate awaits the pilot in this latest incident. According to a Navy Department manual released earlier this year, incidents of sexual harassment "cover a wide range of behaviors, from verbal comments to physical acts, and can be subtle or overt."
If the skywriting over Washington is determined to be sexual harassment aimed at someone in the same squadron, service members involved could be subject to formal counseling, negative fitness reports that hurt careers, administrative punishment, or court-martial and separation from the service.
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)