tensions in Berlin.

The Mark 4 Mod 0 was 60 in in diameter and 128 in long, the same basic dimensions as Mark 3. It weighed slightly more at 10800 to 10900 lb, depending on the specific Mark 4 version. (Mark 3 weighed 10300 lb.)

In addition to being easier to manufacture, the Mark 4 Mod 1 introduced the concept of in-flight insertion (IFI), a weapons safety concept which was used for a number of years. An IFI bomb has either manual or mechanical assembly, which keeps the nuclear core stored outside the bomb until close to the

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