Short AES GCM Tags?

[Mike Duigou]

I've discovered that the Java 8 JSSE doesn't allow 64 or 32 bit tags to 
be used with AES GCM. (Enforced in CipherCore) I had hoped to use short 
tags per the guidance of NIST Special Publication 800-38D Appendix C. 
The Javadoc for GCMParameterSpec mentions 32 and 64 bit tags but I can't 
find an explanation of why small tags are not supported by Java 8 JSSE.

Is there a reason that the short tags aren't offered?
Thanks,

Mike