The Defense Department yesterday reduced the June draft call from 29,500 to 20,000. The Pentagon also announced lower draft calls through the fall, including a July quota of 15,000.

The July call is the lowest since the 11,400 of April, 1967. Draft calls rose sharply at the start of this year because so many men called in the Vietnam buildup two years ago were completing their compulsory service. That cycle has now been completed.

The lower calls should not significantly affect this year's seniors and first-year graduate students, who become draft-eligible in June. Their induction may be a month or two later, but nearly all of them will still be called.