The badge has the same design as special member badge https://asiamedals.info/threads/special-member-badge.23257/
Only suspension has reverse color scheme and reverse insciptions are different.
Suspension of regular member badge.
Suspension of special member badge.
Early "heavy" badges...
dainippon air defense association
full member badge
great japan air defense association
japanese air defense badge
regular member badge
大日本防空協会
大日本防空協会正会員章
大日本防空協会章
正会員章