During the problem liftoffs , foam left dozens of pockmarks on the thermal tiles that cover much of the shuttle , Turcotte said .
During the problem liftoffs , foam left dozens of pockmarks on the thermal tiles that cover much of the shuttle , Turcotte said .
Foam flaking off from all over the tank left dozens of pockmarks each flight on the thermal tiles that cover much of the shuttle , Turcotte said .