Both, really: 'ARPA, was renamed to "DARPA" (for Defense) in March 1972, then renamed "ARPA" again in February 1993, and then renamed "DARPA" again in March 1996.' (Copied from wikipedia.)
And each time some General somewhere noted 'Reorganized unit to align with modern mission goals' as a performance evaluation bullet item for themselves.
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Thanks for the clarification
Both, really: 'ARPA, was renamed to "DARPA" (for Defense) in March 1972, then renamed "ARPA" again in February 1993, and then renamed "DARPA" again in March 1996.' (Copied from wikipedia.)
And each time some General somewhere noted 'Reorganized unit to align with modern mission goals' as a performance evaluation bullet item for themselves.