British soldiers watch gymnast Simona Castro Lazo from Chile perform Sunday during the Artistic Gymnastics qualification at the 2012 Summer Olympics in London. Troops, teachers and students are getting free tickets to fill prime seats at some Olympic venues.

LONDON — Troops, teachers and students are getting free tickets to fill prime seats that weren’t filled at some Olympic venues on the first full day of competition Saturday.

Organizing chief Sebastian Coe answered widespread criticism Sunday by predicting that seats left unused, largely by Olympic and sports officials, will not be an issue as the games proceed.

“It is obvious some of those seats are not being used in the early rounds,” he said at a briefing.

He declined to blame Olympic sponsors, whom he had earlier promised to “name and shame” if they did not use their allocations. Sponsors, including Coca-Cola and Visa, get 8 percent of the 8.8 million available tickets.

The issue is sensitive for Olympic organizers and British sports fans after hundreds of thousands of people failed to get tickets in an initial public ballot.

“There is not a single person who thinks it is shambolic,” Coe insisted, adding no one would object to free tickets for military personnel who “stepped up to the mark” this month to help solve a security staffing crisis at venues.

He said he was “jammed in shoulder to shoulder” with Olympic officials to see swimming finals, including the first Ryan Lochte-Michael Phelps duel on Saturday evening. He also pointed to record crowds lining the men’s road race route, and for rowing events at Eton Dorney.

“Those venues are stuffed to the gunnels. The public are in there,” Coe said.

Yet broadcast images of signature Olympic events, such as gymnastics and swimming, revealed rows of empty seats for qualifying rounds Saturday. Tennis at Wimbledon’s Centre Court was sparsely attended just weeks after the Grand Slam event sold out.

Army personnel attended gymnastics sessions Sunday morning at North Greenwich Arena during down time from security duties.

Students and teachers from east London neighborhoods also would get late calls for free tickets.

Some blame for the opening day embarrassment was falling on “accredited people,” including the Olympic family, athletes, and some sponsors and media, organizers said.

Coe said it was typical at Olympics for sports and national team officials to be “dragged to any number of venues,” and be too busy to attend events in the opening days. “I don’t think you will be seeing this as an issue long term during the games.”