Temporarily assigned to TransDiv 32 on 15 July for the planned occupation of nearby Tinian Island, "Belle Grove" went alongside SS "Dominican Victory" on 15 July to load 9,500 rounds of 75-millimeter tank ammunition. Two days later, she received 2,215 five-gallon (20 l) cans of water from . And on the 22nd, LCMs brought 18 Sherman tanks out to "Belle Grove". Two days later, at dawn on the 24th, the dock landing ship arrived off White Beach 2. The ship ballasted down, flooding her well-deck, and lowered her stern gate to launch the tank-carrying landing craft. The operation passed without incident until one LCM's ramp dropped as it went over the sill and it quickly filled with water. Fast work by "Belle Grove"'s deck crew saved both the LCM and its valuable cargo, and the rest of the landing went smoothly.