For reasons unknown to me, all .mil domains are inaccessible from inside the (scientific) network of the EU Commission. Thus, for some time now I could not access the SCA’s website: http://sca.jpeojtrs.mil/

The solution was not difficult: FoxyProxy Addon for Firefox and a few proxies from Proxy4Free. I add a few proxies from the list, then define a rule that for the SCA url an anonymizer proxy should be used, and voila!