Which, they did a fine job of it, but never liked it. The most common attack employment of the Vought F-8 Crusader in attack was as flak suppression for Alpha Strikes over North Vietnam. But the preferred mission for Crusader drivers was always and ever hunting MiGs.
I’ll admit I never knew about the Shrike tests. And I can guess that the ‘sader guys were quite happy they never got tasked for the Iron Hand mission.