OXNARD, Calif. -- Dallas defensive end DeMarcus Lawrence faced his teammates in the spring, apologizing for a violation of the NFL substance-abuse policy that will sideline him for the first four games this season.The next step was addressing the suspension publicly, which the third-year player did on the second day of training camp Sunday with the Cowboys.My disappointment is its on me, Lawrence said. I messed up. I learn from my mistakes and I just have to move on and get everything right.Lawrences ban was one of three in the offseason for the Dallas defense under the substance-abuse policy. Fellow pass rusher Randy Gregory will miss at least four games and faces a longer suspension over another failed drug test. Linebacker Rolando McClain already has a 10-game suspension.The 24-year-old Lawrence is the only one of the three to report for camp.Gregory is in rehab, raising doubts about whether he will play at all a year after sliding to the Cowboys late in the second round of the draft when he failed a marijuana test at the NFL combine. McClain didnt report after staying away from the team most of the offseason.Both are on the reserved-did not report list, subjecting each to $40,000 daily fines and leaving Lawrence to answer for suspensions that snared three starters.I cant speak for nobody else. I just know my situation, said Lawrence, who led the Cowboys with eight sacks last season. I just made a mistake. Everybody makes mistakes. But its what you do from it.Lawrence is also coming off back surgery in the offseason and is unlikely to go full speed in camp with the suspension looming as well. Hes eligible for preseason games, so the coaching and medical staffs will have to decide how far to go to get him ready for Oct. 9 against Cincinnati.You have to get them ready, coach Jason Garrett said. Hes going to get plenty of work. I do think we can achieve both things, where he still gets his work and lays a foundation for the season, and you still get the other guys an opportunity.Lawrence missed the first half of his rookie season when he broke his foot early in training camp two years ago. He started to show up late that season, getting one sack in the regular season and another in the playoffs. He started slowly last season before getting seven sacks in the final eight games.Now hell have another slow start because he wont be out there until Week 5.Im going to deal with it by trying to help my young guys and making sure theyre ready, Lawrence said. Im just going to work as hard as I can off the field, you know? Just by doing film studies and giving them little keys or whatever they need. Im here for the team.Garrett said Lawrence delivered that message in the spring.Hes a good person, Garrett said. Hes a good teammate. He works hard. He wants to be the best he can be and he wants his team to be the best it can be. I think hes acted accordingly since then.Game notesQB Tony Romo skipped the second camp workout Sunday in order to be available for the first two padded practices Monday and Tuesday. The routine will be similar to 2014, when he was coming off back surgery and had roughly a day off for every two workouts. ... Garrett said several other veterans will get periodic days off, including Dez Bryant. The 2014 All-Pro receiver is coming off two surgeries after breaking his right foot in the opener last year.---Online:AP NFL websites: http://pro32.ap.org and http://twitter.com/AP-NFL---Follow Schuyler Dixon on Twitter at https://twitter.com/apschuylerCheap Jerseys USA . 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The designation was released Monday after the deadline passed for NFL teams to use franchise or transition tags on players becoming free agents.There is always plenty of drama when the New York Red Bulls and D.C United square off but Sundays match at Red Bull Arena in Harrison, N.J., is for a lot more than just bragging rights and this seasons Atlantic Cup.The Red Bulls (12-9-7, 43 points), just a point off of the top of the Eastern Conference table with six regular-season matches left, carry a two-game winning streak and a 10-match run without a loss into play and cannot afford to take a step back.D.C. United (7-9-11, 32 points) have dropped into seventh place in the Eastern Conference two points behind Orlando City for conferences sixth and last postseason berth. United needs the points in New Jersey to right its ship after having its six-game unbeaten streak snapped last Thursday in a wild match at Yankee Stadium by New York City FC.With just even matches left we dont have a lot of margin for error at this point in the season, D.C. United coach Ben Olsen said. Weve got to start cookin a little bit.The Red Bulls roster sports two of the most dynamic players in the league with English striker Bradley Wright-Phillips and middfielder Sacha Kljestan.ddddddddddddWright-Phillips began the weekend tied atop the Golden Boot standings with 17 goals, has scored in six of his past seven league appearances and twice during that streak scored two goals in a match. Kljestan is first in assists with 15.United will be without Luciano Acosta, their top playmaker, who will miss the match because of accumulated yellow-card infractions. Forward Lloyd Sam will be making his first trip back to Red Bull Arena since he was traded by New York to D.C. United in July.D.C. Uniteds defender and captain Bobby Boswell is on the verge of making his 350th MLS regular season appearance and joining an elite list of only six players to reach the milestone since 1996.The Atlantic Cup foes have already met twice before this season, with the two previous encounters at RFK Stadium. D.C. United won 2-0 at home on May 13 before splitting the points with the Red Bulls in a 2-2 draw on Aug. 21 on a rain-soaked pitch. ' ' '