All of the Tulane football team’s preseason objectives remain attainable, but they will become unreachable soon if the Green Wave continues playing at its current level.

The emergence of Memphis , South Florida and Navy as serious contenders for the American Conference championship has left little margin for error, and coach Jon Sumrall knows Tulane (5-1, 2-0) is making far too many mistakes to survive without significant improvement entering the second half of the season.

The Wave hosts defending American champion Army (3-3, 2-2) on Saturday (11 a.m., ESPNU).

“I don’t think it helps them for me to just lose my mind all the time because they are going to tune me out, but on Saturday morning I showed them on two screens (in the meeting room), hey look, this will cost us,” Sumrall s

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