[central_va]

The German V-weapons (V-1 and V-2) cost $3 billion (wartime dollars) and were more costly than the Manhattan Project that produced the atomic bomb ($1.9 billion)

[FredZarguna]

Resources ≠ dollars. Heisenberg did not have the qualified metallurgists, engineers, and mathematicians, nor was Germany willing to divert money from conventional programs for the purpose. Nevertheless, Heisenberg's post-war claims that he deliberately foot-dragged the project are almost certainly fiction.