Contact, Global Mobilization and now Art of War all include freely available assets for non-DLC owners (as the content is already patched into your game files, with exceptions such as the map, in the case of Contact). Most of these assets will however show DLC ads or disallow parts of the content from being used by players who don't own the DLC.
I believe some of the CBRN gear we almost used last cycle may have been from Contact - may have not, as there are CBRN mods out there.
As for the SOG DLC, this may be a long way out, given that CSLA Iron Curtain was announced before this and hasn't come out yet.
