Anti-Aircraft Units
The design most often found on anti-aircraft cups is an
anti-aircraft gun pointing skyward. Oftentimes a crudely
painted plane is above.

There are also spotlight (air illumination) designs, but these
are quite rare. I have one example below.
The kanji for 'anti-aircraft, read right to left:
KOUHOU. The full phrase is 4 kanji:
KOUSHA HOUHEI.
SHOKUTO Air Illumination,
used for spotlight units
Anti-aircraft unit insignia. Inscribed 'In
celebration of discharge, 1st Anti-aircraft
Unit.'
KOUSHA-HOU
Anti-aircraft unit cup with spotlight and three
planes.  Inscribed '
Kanto-gun (Kwantung Army)
Anti-aircraft Artillery 2nd Division, Victorious
Return Commemorative'.
Inscribed '1st Anti-aircraft Commemorative'.
Inscribed '4th Anti-aircraft, China Incident
Commemorative'.
Inscribed '1st Anti-aircraft Commemorative'.
Inscribed 'Korea, Pyongyang,
Anti-aircraft Artillery'.
Inscribed '1st Anti-aircraft Commemorative'.
'1st Anti-aircraft Unit,  Discharge Commemorative'.  
Inscribed 'Victorious Return Commemorative, Kanto-gun
[Kwantung Army], Anti-aircraft Unit, 2nd Division.'