Hehehe, the Scars of ww2 are still fresh in American think Tanks mind, they will never let Japanese be an arms exporter.
1) Till today they do not call their army "army' but SDF (self-defence force)
2) They don't have any kind aircraft carrier, because of sanctions pressed on by the US.
Fun fact: They have experience of building 4 aircraft carriers, even more than India. As for tech they have been building heli-carriers since they can't make aircraft carriers.
That is to say at any time they have a full tech to make an advanced aircraft carriers any time they decide to f*ck US sanctions.