Russell's Military-Themed Coming Home Cake

I threw a coming home party for my brother who is in the military, and is visiting for a few weeks.  We haven't seen him in a year and a half so I wanted to go all out and make a great cake.  And here's the result!

I made homemade blue piping gel for the water which could have looked better but the first coat I put on ran down the sides of the cake, so I let it drip off before adding a thicker gel.