William Burr’s “The Limits of Limited Nuclear War,” in the January/February issue of Arms Control Today incorrectly described the smallest nuclear option in current U.S. military war plans as an attack with 150 nuclear weapons. The relevant sentence on p. 44 should have read, “In the following years, however, U.S. war plans began to provide for truly small limited options; they now range between 2 and 120 nuclear weapons, close to what Nixon-era policymakers were seeking.”

• A headline on p. 21 of the same issue was inaccurate. The headline mischaracterized an article by Alexander Glaser and Frank von Hippel about the debate over ending the use of highly enriched uranium (HEU) in medical-isotope production. The article should have been entitled “Ending HEU Use in Medical-Isotope Production.”