text: Chapter 4
  High, Multistory Buildings--For buildings with more than four stories or with multiple sections
  (or wings), the team should report the level of damage for each story, section, or wing
  individually and that of the structure as a whole. For example, if a ten-story building receives
  severe damage to the upper three stories, they report the level of damage to those three floors
  plus the level of damage to the structure as a whole, which in this case might be assessed as
  moderate.
  Buildings with Multiple Wings--For buildings with multiple wings, the team reports the
  destroyed wings and the damage to the remainder of the structure. For example, they might
  report that the North and South wings of a headquarters building have been destroyed, while
  the center section sustained only moderate damage.
  PHYSICAL DAMAGE
  4-130. Target-element-area damage includes damage to non-load-bearing elements such as facades and
  external sheathing, as well as broken windows and glass, blown-out curtain walls, and blown-out
  roof panels.
  No Damage--Military action has caused no apparent damage.
  Light Damage--At this level of damage, the target-element area has sustained up to 15
  percent damage.
  Moderate Damage--At this level of damage, the target-element area has sustained from 15 to 45
  percent damage.
  Severe Damage--At this level of damage, the target-element area has sustained from 45 to 75
  percent damage.
  Destruction--At this level of damage, the target-element area has sustained from 75 to 100
  percent damage.
  FUNCTIONAL DAMAGE
  4-131. The greater the extent of physical damage to the building, the greater the likelihood that the
  critical element(s) within is damaged, hence the building requires a longer recuperation time to restore
  the function.
  Location and Hardness--Although the level of physical damage to a building and functional
  damage to its critical element(s) correlate somewhat, the location and hardness of a building's
  contents are the keys to a meaningful functional assessment. For example, in an industrial
  building, the machinery may be less vulnerable than the structure in which it is contained. The
  structure might be moderately damaged, while the machinery it houses sustains little or no
  damage. On the other hand, fragile computer or other electronic equipment might be destroyed
  while the building that houses it sustains far less functional damage.
  Contents--Framed structures tend to show less apparent physical damage and is less likely to
  collapse than other types of buildings. Thus, determining the functional damage to the contents
  of a framed building is more difficult than assessing those of a wall-bearing structure. These
  tend to show more physical damage, and they collapse more readily, causing greater functional
  damage to their contents than do framed structures.
  Recuperation--The team reports recuperation for both the structure and for the critical elements.
  Structural Damage as Unusability Criteria--General weaponeering guidance considers a
  building unusable (functionally destroyed) when it has sustained 50 percent structural damage.
  Depending on the type and location of critical elements, a lesser percentage of damage may be
  adequate to achieve the desired level of functional degradation.