It was not surprising that the mass media response to the 2015 defense budget was that it would result in “the smallest Army since before World War II.” It would have been a shock had anyone continued: “and it’s a good thing.” But it is—and Russia’s current actions in the Crimea do not change that fact.

Reversing the early-2000s growth in land forces is a start on what has to be a 20-year effort to forge a military that’s actually relevant for the future.

Today’s force has its roots in an era when wars were fought on the land and on the sea, zealots explored the air, scientists dreamed of space and cyber did not exist. Forces had to be within visual range in order to gauge each other’s strength and start thinking about tactics. The intelligence, surveillance and reconnaissance role was in the embryo stage.

But even in 1939, the boot-centric view of warfare was on shaky ground. Large standing armies with professional leadership were an idea less than 100 years old. The Greek and German classic studies of warfare were based on Europe—then as now unique in short distances and high population density.

Historians bemoan the pre-WWII U.S. Army’s lack of readiness and its reversion to pre-1917 habits. But a nation that had no fear of land invasion did not need to make its army a priority. That is the case today.

The argument that land forces have special strategic significance is weak. The record of boots-on-the-ground wars is that they usually cause more problems than they solve. The argument that they are the nation’s prime military means, or that other services exist only to support them and get them to the fight, is neither realistic nor helpful.

Globally, there are few cross-border land threats to which the U.S. would respond. North Korea’s shift of resources to missile technology means that land attack is no longer the main threat to the South. It takes a stubborn refusal to read headlines or history to think that the U.S. will send land forces across borders to promote democracy again, at least for a long time.

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