The Guided Bomb Unit 28 (GBU-28) is a 5000-pound (2268 kg) laser-guided "bunker busting" bomb nicknamed "Deep Throat."
The Israeli Air Force could launch missiles to attack Iran, but Iran would certainly retaliate with its own missiles. The Harretz article suggests that an Israeli attack would go on for hours. A lengthy attack would increase Israeli fatalities and also lose the element of surprise.
The big Israeli delimiters are shortfalls in fighter-bombers and a limited aerail refuleing capability.
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