Golden Age:
In CCM a Golden Age can only be triggered by Great wonders. If a unit is set to trigger it, this would be an error. The last unit that was disabled for triggering a GA in CCM is the Janissary in the CCM betatest v.1.5.
For triggering a GA in CCM three traits must be fullfilled by GWs. This can be done by different GWs, so if a GW is only hitting the last missing trait, the GA is triggered when the civ builds the last missing wonder.
In CCM v1.4 there is no GW that has especially the agricultural trait, as I think this trait is the strongest of all. In CCM v1.5 the GW Hanging Gardens will have the agricultural trait. So a GA for Indochina can only be triggered by one of the GWs in era 4, that trigger all traits. These GWs are UN, Eiffel Tower and the Internet (hope I haven´t missed one). There are some civs that have special GW that always trigger a GA for them (if these civs didn´t had one before). For example: Buckingham Palace, Zeus Statue, Arc de Triomphe, Brandenburg Gate, Kremlin, Libery Statue and a lot more. Indochina doesn´t have such a wonder as it is a mixture of several countries.
Unique units:
There are no special unique units in CCM as there are tons of different units (even with different stats according to the performance they did in history) and therefore nearly every unit is a unique unit - but none of them should be able to trigger a GA:
For example here are screenshots showing the techtree of era 4 for the US, Britain, Germany and for Russia:
As you can see, the techs enable different units with different stats. Per example a British Chieftain tank is better than a US M-60 (but more expensive), a US B-52 bomber is better than a British Vulcan, the US can build the Long Beach-Class with nuclear reactors, the British (and all others) can´t, the Germans don´t have heavy jetbombers in era 4 and so on.
There are also some autoproduced units that are heavier than the normal units but are only available for that civ in small numbers. They must be autoproduced as otherwise the human players and AI would only produce these units and this would distort the game. So for example there are some Tiger tanks for Germany in addition to the normal PzKpfw III (and later Panthers), some additional JS III tanks in addition to the T-34s for Russia and so on. For the US per example in WW II a special unit was created for CCM, that does a heavy strategic bombardement and also is a killer for fighters that want stop this unit: The escorted bomberraid done by Wotan49 and Vuldacon, autoproduced by the GW "USAAF" (only available for the US).
If there are questions of lurkers about CCM, I´m happy to answer them in the CCM-forum at CFC:
http://forums.civfanatics.com/showthread.php?t=352057