This picture is a lot more disturbing when you remember that the "warships" she's referring to are living girls who she claims need to be "scrapped."
I wonder if Matsuryuu drew this after making a fleet that was too large in the actual game.
10 months late so this is very inconsequential, but there is a daily refreshing quest in the game which rewards you with a very small amount of resources for scrapping two ships, which is titled Naval Treaty Concession!. Said quest is probably a reference to the real-life Washington Naval Treaty and similar such treaties, where the major powers after World War I decided not to build too-large fleets.
This girl Ooyodo is the quest NPC, hence the picture.
Please "SCRAP" two unneeded warships ♥Our fleet grew a bit too big...