It's not like seamen are afraid of getting a little wet and salty!

Explanation From Wiki:

[During the D-Day Landings] By 15 June, the troops had advanced to the edge of Texas’s gun range; her last fire support mission was so far inland that to get the needed range, the starboard torpedo blister was flooded with water to provide a list of two degrees which gave the guns enough elevation to complete the fire mission.