We have heard that families and other groups can “pool” their baggage authorization. What’s the story?

Space-A passengers traveling together as a group (that is, listed on a single Military Transportation Authorization or AMC Form 140 (Space Available Travel Request)) may pool their baggage authorization so long as the total number of checked pieces does not exceed the number of travelers times 140 pounds, i.e., a five-person family travel group could not exceed 700 pounds (5 x 140 pounds = 700 pounds) and 10 pieces (5×2=10).