Retired CW4 here. IIRC, the last USAF WO was appointed in 1969. May have had to do with debate over what is appropriate rank for pilots.
FWIW, about 45 percent of the Army’s WO’s are aviators.
Anyway, happy 99th birthday to the Army Warrant Officer Corps. Proud to have served. BTW, occasions like this & others are now celebrated with cake because toasting with champagne was found objectionable to some.
Need I specify who?
Put booze in the cake.
CC