Japanese Missile Defense

Japan wold fuck shit up.

Why would it need to roll?

It is possible to shoot it down while its still in N. Korea if they could recieve the info on launch beforehand.
What do you think the Kongo-class Aegis destroyers are for?

The Kongo-class Aegis destroyers are a modification of the US Arleigh Burke class (Flight I). The are equipped with RIM-66 Standard as an air intercept weapon. Even if they were able to find out the launch site and launch time information in advance, (the launch time being especially doubtful) then there would be very very little time to engage the missile before it left Korean airspace, so NO it isn't possible. Additionally the Standard SAM system has only limited anti-missile capability.

Wrong. Kongo-class started out as normal flight I Aegis, but with the BMD project, 2 out of 4 Kongo-class have alreaady been customized to use RIM-161 SM-3, with the remaining 2 following soon.
So, provided they could get the advance intel, it is possible to shoot it down over N. Korea although it's unlikely. If they couldn't get the info, they'd have to sit back near the Japanese coast and shoot it down from there.
By combining SM-3 and PAC-3, they think they can shoot down 90+% of MRBM.

I believe this is from the U.S.A (I saw a similar video from the usa navy) not Japan, but then again I could be wrong

You are wrong.
The one you had probably seen is the SDACS developed by the US which employs only on-off valves. This thing is the "TSDACS" developed by Japan, which employs continuous control of the valve, which means it is "throttlable". Hence the T in front of SDACS.
Japan and US have been designing their TSDACS for SM-3 blk2a in parallel. US has never hover tested their design, but they have successfully hot-fired it.

the moving warhead in this vid is made in Japan but rocket part is made in USA

Will you guys stop making irresponsible nonsense comments?
The first stage rocket motor is US made but the 2nd and 3rd stage rocket motors are Japan made.
1 minute of google search will get you this far.

Whoa dude that shit is fucken crazy..We got those things.