Officials with the Naval Air Station at Whidbey Island in Oak Harbor, Washington apologized in embarrassment after their pilots were discovered to have “drawn” an image resembling male genitals in the Washington sky on Thursday.

Residents in the rural, small-town area who saw the unusual creation took photos and posted them on social media.

Later, on Friday, officials at the Naval Air Station Whidbey Island announced that the crew responsible has been grounded.

The image in the air was reportedly created by an E/A-18 Growler aircraft, which carries a two-person crew, but their names were not released.

“The actions of this aircrew are wholly unacceptable and antithetical to Navy core values” said a statement issued Friday by NAS Whidbey Island.

“We have grounded the aircrew and are conducting a thorough investigation,” the statement said, “and we will hold those responsible accountable for their actions.”

“The Navy apologizes for this irresponsible and immature act, and anyone who was offended by this unacceptable action,” the statement said.