The Arm in Arm decal the Cowboys unveiled to open this camp won't be worn on their helmets during the regular season.

But the club is still in discussion with the NFL for it to be worn during their four preseason games.

"Well, I don't think we'll be able to do it during the regular [season]," executive vice president Stephen Jones said. "It's up for debate as to whether we can wear them in the preseason games."

Cowboys players, coaches and administrators walked onto the field for Saturday's first practice arm-in-arm with Dallas city officials, members of the Dallas Police Department and family members of the officers slain in the ambush in Dallas earlier this month. A decal signifying the club's support for the city and those families was placed on the back of the Cowboys helmets.

The NFL's refusal to allow the club to wear the decals during the regular season isn't a repudiation of the sentiment.

"There are so many wonderful, wonderful causes, the league has to be careful," Jones said. "If you allow one, then what do you do about every team that has a great reason to have something on their helmets?

"There are tons of things out there that need to be recognized. Once you open that Pandora's box, how do you ever stop?"

Twitter: @DavidMooreDMN