sentences:  A total of more than 12,000 were made, making its use as a heavy bomber second only to the B-24 Liberator.Though used at some point in all theatres of World War II, it was most common in the European Theatre, where its lack of range and smaller bombload relative to other heavy bombers was not so detrimental as it was in the Pacific, where most American military airbases were thousands of miles apart.Brazil acquired 13 B-17s in 1951, according to the Rio Pact of 1947.