There is no emi to meet standard. You have heavy filters which attenuate but depending on your load it might not ben enough and you might need a custom emi filter, two filters in a row (diminishing rreturns, some manufacturers specify series operation) or maybe get away with adding some ferrite.
Search military emi filter because if you filter dc rail with a dcdc converter you get some negative resistance stuff and the mil emi filter will have a dampened cap to make it work right
You need to read the standard carefully to see what the allowed noise levels are inside of your subassembly past the power distriibution point but you dont want to contaminate their systems
Commercially no one would care since its your own black box so long you dont get degraded performance..
I cant see why the mil would try to specify noise levels in your circuit unless you have some claus that say ttl logoc at some impedance needs to have noise margin of so and so. Commercially it would just need to pass emissions and suceptance.
And its impossoble to tell you on a forum how to pass class b or tighter emi compliance. If you posted full schematics, pcb layout and your notes and the chassis assembly mechanical assembly shop prints and detailed pictures we still could only guide you on what can possibly be improved.
Cots look for medical and stuff advertized as low emi etc but you need to test it lol... people dont always claim to have met the sayings of the datasheet.
One thing that comes to mind is the expensive ltc umodule (the one advertized as meeting class b), they have a few. Its has minimum extra components needed and small loop area