Conversation so far:
Did Mike Gravel have a problem with the Nuclear bomb ?
The Milrow test would be a one-megaton calibration exercise for the second and larger five-megaton Cannikin test, which would measure the warhead's effectiveness. Mike Gravel opposed the tests.

Question: What were his reasons for opposing it ?
Self-contained rewrite: What were Mike Gravel's reasons for opposing the Milrow test?