Why not go and look it up for yourself?
You appear to be thinking of
"The Convention on Prohibitions or Restrictions on the Use of Certain Conventional Weapons Which May Be Deemed to Be Excessively Injurious or to Have Indiscriminate Effects as amended on 21 December 2001(CCW)"
and, the US agreed to that convention on April 8, 1982 (when Ronald Reagan was the President of the United States of America) - but didn't actually get around to ratifying it until March 24, 1995 (when William J. Clinton Jr. was the President of the United States of America).
Thank you for, once again, confirming that you don't know what you are talking about.
BTW, did you know that "the United States didn't sign on to that treaty" does not, in the least, diminish the truth of what I posted. Of course you did, you just hoped that others would be so stupid as to think that it did.