Nancy
You buy your board to IPC-6012, Class 3.  The 600
document is a pictorial document that supplements
the 6012 specification.

6012 has sampling plans and the required tests that
are to be performed on each lot (for class 3) - like thermal
stress as well as listing responsibilities for monthly tests.

If you called out only 600 there are no requirements for
testing - just the photos that show what your product should
look like if you did the testing.

IPC-6012, Class 3 correlates to the military specifications.

Susan Mansilla
Robisan Lab

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