Training camp at Princeton University -- head coach Bob Bradley's alma mater -- began this morning and not everyone on the 30-man roster could make it. Here's a quick recap of who wasn't available on the first day and why:

-- Landon Donovan, Edson Buddle and Jose Francisco Torres were not on the practice field today because they were taking physicals. Most of the other players took care of that Sunday.

-- Tim Howard has been dealing with a quad strain and was kept out of training. The injury has "mainly been affecting his kicking," Bradley said.

-- Jay DeMerit (abdominal), Eddie Johnson (hamstring) and Chad Marshall (hamstring) were kept out of training. Marshall played the full 90 in Columbus' game over the weekend, but left with a slight strain, Bradley said. U.S. soccer officials are listing these guys as day-to-day.

-- Caros Bocanegra was able to warm up with the team and did some ball work, but did not practice at full strength. He said he would be at about 100 percent by Wednesday or Thursday.

In non-injury-related news, Clarence Goodson and Benny Feilhaber were not at practice but are arriving today. Alejandro Bedoya and Oguchi Onyewu are arriving Tuesday.

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Photo credit: AP