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The Staff of SOH
TARPsbird has it...
Bottom Line, Force Survivability refers to the ability of any force or platform to remain mission capable after an engagement.
You will also see there are different components of Force Survivability that make up the whole; the vulnerability of the force (or platform), the susceptibility of being detected and struck, and the ability of the force or platform to recover.
This has real implications when planning any sort of offensive or defensive action. You will also see it in relation to another concept...."Force Multiplier". Certain tactics, techniques, procedures (TTPs), or equipment sets are known as "Force Multipliers". Force Multipliers make what would otherwise be a smaller force far more lethal and up to taking on a larger force. Despite what some may think, U.S. land forces are fairly small (usually outnumbered), but a force multiplier removes the differences quickly.
An example in ground combat operations of the use of a force multiplier would be the use of Attack Helicopters....a fantastic Force Multiplier. However, going back to your original question, the Force Survivability of an Attack Helicopter Battalion is considered to be very low (despite Hollywood's depiction of the HIND....they actually blow up real good). A planner and his commander must take both into account in determining a coarse of action.
This all sounds rather grotesque to most civilians when they hear these kinds of things, but believe me, no one forgets that the force is made of people.
In general, there are very few times when U.S. military commanders will sacrifice a force for a mission (the whole idea is to prevent yourself from ever being it that position), but it does occur.
Re: that last statement - sounds like this means one of those things like "even if we lose the whole unit, but destroy the objective, it will be worth it - shorten the war by 6 mos - etc." This was the rationale given for the August 1, 1943 ultra-low-level attack by B-24s on Ploesti, in Romania. The oil fields there were thought to be so valuable to Germany's war effort that their destruction, even if all 173 B-24s actually striking the target were lost, it would still be worth it according to the planners, including 9AF Commander LGEN Brereton. Even so, in actuality losing 1/3 of the entire force was a stunning price to pay for a relatively successful raid - so stunning, in fact, that from that date forward 9AF never again had a heavy bomber component.
Another excellent example of a force multiplier is any tanker aircraft, such as a KC-135 or KC-10, extending the range of what could otherwise be rather short-legged aircraft - and thus bringing hostile targets under attack at a much greater radius than would otherwise be possible. You could also say the Sentry AWACS is an excellent force multiplier as it allows much more precise (therefore efficient) tasking and control of airborne assets - as does the JSTARS for ground forces. Tankers/AWACS/JSTARS are VERY high-priority targets for hostile air forces or defenses, their loss will cause a significant degradation of offensive or defensive capability. I remember Tom Clancy's "Red Storm Rising" describing extremely costly, but ultimately successful, Soviet Frontal Aviation efforts to bring down an AWACS during the fictional invasion of Western Europe by WP forces, which signicantly impaired NATO's ability to deal with Soviet air and land forces in the story.
Good reply! Love these intellectual exercises and historical "what-if" ing!
P.S. Does Bataan/Corregidor qualify under your "defense" scenario? I am wondering about this. It wasn't voluntary - circumstance resulted in the isolation and destruction of the U.S. units.