<text id=b5200003><title>Boeing—B-52 Stratofortress: USAF Variants and Serials</title>
<history>US Air Force: Aircraft</history>
<article><hdr>Boeing—B-52 Stratofortress: USAF Variants and Serials</hdr><body>
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<item><hi format=bold>GB-52G:</hi> Surplus B-52Gs have begun to join Air Training Command as ground instructional airframes, including three with the Sheppard TTC (82nd Training Wing).
<item>· 57-6469; 58-0200; 59-2578
<item><hi format=bold>B-52H:</hi> The most distinguishable feature to differentiate the B-52H from its predecessors is the fitment of TF33 turbofan engines in place of the J57 turbojets, and a six-barreled 20-mm rotary cannon instead of the four 0.5-in guns. One hundred and two B-52Hs were obtained during 1960 and 1961 with all, except a handful lost in accidents, remaining operational.