I think most CI and security personnel should join Infragard because it is an extra channel to receive good threat information from a different channel. Like anything, if you participate you get more assistance. In the military we would want to know who is our left and right flank units. In the civ world we also need to know, and Infragard is a good way to know how hard others are getting hit by various threats. It is free, if you meet the field of membership.