In The Hulk 2003, why does The Hulk just willingly give himself up to the military? Why doesn't he keep trying to run away?

He spent about 20 minutes of the film trying to escape them. Why would he then let betty calm him down and then go with them?

In The Hulk 2003, why does The Hulk just willingly give himself up to the military? Why doesn't he keep trying to run away?
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