Money wise maybe but nothing else compares, 3 million troops in Vietnam and 47,000 killed with 153,000 injured.
http://www.infoplease.com/ipa/A0004615.html

Interesting stat, out of all major US conflicts only 2% of active serviceman died in battle out of over 42 million total US persons. And only 3% were wounded, so in all 95% of serviceman since 1776 have been fine

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