Maybe its to improve public transport infrastructure
I mean it's probably no problem at all to purchase 470 double-decker buses for a photo-op when it's about such a large ship. The cost of that is just negligible. While it's much harder to buy such buses normally.
So if you buy 470 double-decker buses out of the military PR budget, make that photograph, and then sell them to local communities for a symbolic price, you will have made a serious improvement to the public transport infrastructure.