There is a long evolutionary process about SBR rules:
AA50 SBR
Fg A1 D2 C10, StB A0 C12, AAgun unit first on Fg and StB, then dogfight phase.
Damage D6
Spring 1942 SBR
Fg A1 D2 C10, StB A0 C12, dogfight phase first, then IC’s AAgun on StB only.
Damage D6
G40.1 SBR
Fg A1 D2 C10, StB A0 C12, dogfight first, then IC’s or Bases AAgun on bombers.
StB Damage D6
Tactical bombers cannot attack bases.
1942.2 SBR
Fg A1 first strike D2 C10, StB A1 first strike C12, dogfight first, then IC’s AAgun on StB only.
Damage D6
First strike means you have to remove immediately defender’s interceptors casualty and cannot roll to hit.
G40.2 SBR
Fg A1 D1 C10, StB A1 C12, TcB A1 C11, dogfight first, then IC’s or Bases AAgun on bombers.
StB Damage D6+2
TcB Damage D6 on bases only.
Triple A for 1942.2 (WWII v.5) SBR
Fg A1 D1, StB A1, dogfight first, then IC’s AAgun.
Damage D6
Triple A for AA50 (WWII v.3) SBR
Fg A1 D1, StB A1, dogfight first, then AAgun unit on Bombers only.
Damage D6
Redesign SBR 3 combat values options to be playtested:
Global and 1942:
Option #1
Fg A1 D1 C10, StB A0 C5, TcB A1 C10, dogfight first, then IC’s or Bases AAgun on bombers.
StB Damage D6
TcB Damage D6 on bases only.
Option #2
Fg A2 D2 C10, StB A0 C5, TcB A1 D1 C10, dogfight first, then IC’s or Bases AAgun on bombers.
StB Damage D6
TcB Damage D6 on bases only.
Option #3
Fg A1 D2 C10, StB A1 C5, TcB A1 C10, dogfight first, then IC’s or Bases AAgun on bombers.
StB Damage D6
TcB Damage D6 on bases only.
AA50 Original SBR rules:
Fighter Escorts and Interceptors
Fighters can participate in strategic bombing raids. Attacking fighters may escort and protect the bombers, and they can originate from any territory, range permitting. Any or all defending fighters based in a territory that is strategically bombed can participate in the defense of the industrial complex. The number of fighters that will defend is decided after the attacker’s Combat Movement phase is completed and before the Combat phase begins.
After antiaircraft fire is resolved against the attacking air units, if there are any defending fighters an air battle occurs between the attacking and defending air units. This combat is resolved in the same way as a normal combat, with a few exceptions. The fighters have an attack value of 1 (2 if the attacker has the Jet Power research breakthrough) and a defense value of 2, and the bombers have no attack value. In addition, the combat lasts for only one round.
After the battle, any surviving bombers proceed to carry out the raid as normal.
Fighters participating as either an escort or a defender cannot participate in other battles during that turn. Defending interceptors must return to their original territory. If that territory is captured, the fighters may move one space to land in a friendly territory or on a friendly aircraft carrier. This movement occurs after all of the attacker’s combats have been resolved and before the attacker’s Noncombat Move phase begins. If no such landing space is available, the fighters are lost.
AA50 FAQ and Erratas
Global 1940, first edition SBR rules
Strategic Bombing Raids
A strategic bombing raid is a direct attack on a facility. During this step, you can bomb enemy industrial complexes, airbases,
and naval bases with your strategic bombers. When you damage these facilities, their capabilities are decreased or eliminated,
and your enemy must spend IPCs to repair them in order to restore those capabilities. These repairs will be made by the units’
controlling player during his or her Purchase & Repair Units phase (see Purchase and Repair Units, pg. 10).
To conduct a strategic bombing raid, the attacking player moves his or her bombers to the targeted territory on the map. Fighters (not tactical bombers) can also participate in strategic bombing raids as escorts and interceptors. Escort fighters (those accompanying the attacking bombers) can escort and protect the bombers, and they can originate from any territory, range permitting. They cannot participate in any other battles during that turn, including a battle in the territory in which the bombing raid is occurring. This applies whether or not the defender commits any interceptors.
Any number of defending fighters based in a territory that is about to be strategically bombed can be committed to participate in the defense of that territory’s facilities. If the defender has elected to commit fighter interceptors, an air battle will be fought immediately before the strategic bombing raid is conducted. This air battle is resolved in the same way as a normal combat, with the following exceptions:
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The attacking bombers and fighter escorts and the defending fighter interceptors will be the only units participating in this special combat.
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The attacking strategic bombers will not fire in the battle, but they can be taken as casualties. Players select their own casualties based on the number of hits received during the air battle.
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The combat lasts for only one round.
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The fighters have an attack value of 1 and a defense value of 2.
So, having bombers with zero attack capacity has been done in the history of A&A.