I saw several articles on the process to be embedded. They had to go to a "bootcamp" and I think some of them had to agree to withhold sensitive information if that information would put troops in harms way. Info on embedding here:
In those ground rules, reporters must agree to honor news embargoes that may be imposed to protect operational security. An embargo means that no reports can be filed about a specific military operation before it occurs, or while it is under way. The embargoes will remain in effect until US military officials determine that the threat of compromising operational security has passed.
Only approximate figures will be allowed to be reported about the strength of US troops and their allies, as well as casualties. Information that cannot be reported - on grounds that it would jeopardize operations and endanger the lives of troops - include specific troop deployments or numbers of aircraft, tanks, artillery, landing craft, radar units and trucks.
The names of military installations or specific geographic locations of military units in the Gulf region also cannot be reported unless specifically released by the US Department of Defense. News and images that identify or include identifiable features of troop locations also are not authorized for release.
Also, reporters are not allowed to disclose information about the effectiveness of enemy attacks, camouflage, deception, targeting, intelligence collection or security. Photographers and television cameramen also will only be allowed to record images of dead US soldiers if the images do not show their faces or name tags. In compliance with the Geneva Convention, no photographs, video footage or interviews of Iraqi prisoners of war is allowed.
http://www.atimes.com/atimes/Middle_East/EC13Ak01.html