The climate for the transfer of American arms to other countries has changed in the year since Ronald Reagan became President. In the fin-a months of President Carter\u27s term there was a commitment to constraint. But it was undermined by events during the last two years of Mr. Carter\u27s Presidency. Just as substantial obstacles prevented President Carter from restraining the sale of arms as much as he would have liked, so roo wilI President Reagan confront many obstacles in his plan to increase arms transfers