Creating and assigning policies

[Dennis Putnam]

I have an installed Kerberos database that I need to set up policies  
for.  As such I have 2 questions:

1) This is an established working kda but no policies are assigned to  
any principals. However, when I do a listpol, I get back:  
policy1438560min. Is this a required default policy the installation  
created or is it something I can delete?

2) Once I create a policy, how do I assign it to all users en mass.  
All I can find seems to imply I have to do it for each individual user.

Thanks.