First it was the Mountain West stopping Boise State from wearing its traditional all-blue uniform on the blue turf of Bronco Stadium for conference games.

Now the NCAA is poised to end the practice for all games.

The NCAA Football Rules Committee proposed several rules changes Wednesday, including one that would require teams to have either jerseys or pants contrast in color to the playing turf.

In other words, no more blue pants and blue jerseys on the blue turf.

The rule would also stop teams from wearing all green uniforms on green playing surfaces, or red on red in the case of Eastern Washington.

The Playing Rules Oversight Panel must adopt the changes. The panel meets March 6 and typically approves recommendations from the rules committee.

Boise State has not been allowed to wear all-blue uniforms at home during Mountain West games the past two seasons. The Broncos did wear all-blue for nonconference games.

"I thought it was ridiculous," Boise State coach Chris Petersen said when the Mountain West ban was put in place in 2011. "That's our colors. That's who we are. That's who our fans have wanted us to be since I've been at Boise State. That's what it's been through and through."

Petersen was not available for comment to the Idaho Statesman or the Associated Press on Wednesday, a school spokesman said.

As part of their agreement to remain in the Mountain West - rather than join the Big East starting this fall - the Broncos negotiated the right to wear any uniform combination.

Air Force coach Troy Calhoun said the rule would prevent players from being "camouflaged.''

Opposing coaches have complained that the Broncos' all-blue uniforms make it difficult to prepare for games in Boise because it's hard to differentiate Broncos players against the blue backdrop.

"Our whole point is we want to be completely respectful of those institutions that have different-colored fields, especially ones that aren't green, but still make sure there are some contrasting colors worn by that squad,'' Calhoun said.

Other proposed rules changes from the NCAA include:

• A player who delivers a hit to the head of a defenseless opponent could be kicked out of the game. The rules committee said it unanimously approved strengthening the 15-yard penalty for intentional above-the-shoulder hits.

Calhoun said the committee wanted to address clear instances where a defender is leading with the crown of his head to hit a defenseless player above the shoulders.

"It's a real problem in the sport,'' he said, "and we need to eliminate it.''

Last season, Calhoun said, there were 99 targeting penalties called in the Football Bowl Subdivision that, under the proposed rule, would have called for an ejection. He said the player on the receiving end of the hit in many cases sustained a concussion or other type of injury that caused him to miss significant playing time.

"It's not a gigantic number,'' Calhoun said of the 99. "Ultimately, our goal is zero. Is that realistic? I don't know if zero is. But I know any time you involve an ejection, we're going to see that number go down drastically immediately.''

If the penalty occurs in the first half, the player would be ejected for the remainder of the game. If the penalty occurs in the second half or overtime, the player is ejected for the remainder of the game and the first half of the next game.

The rule would allow for the ejection portion of the penalty to be reviewed through video replay. The replay official must have conclusive evidence that the penalized player didn't intentionally target a defenseless player in order to overturn the call on the field. Calhoun said the 15-yard portion of the penalty would not be reviewable.

• The committee also attempted to simplify the blocking-below-the-waist rule, which was found to be unevenly enforced and difficult to teach to officials, Calhoun said.

Now low blocks delivered from in front of the defender anywhere on the field are legal and low blocks from the side or back are not.

Previously, whether a player could block below the waist depended on his position at the snap, whether he was stationary or which direction he was moving after the snap.

• Adding a 10-second runoff with less than a minute remaining in either half when the sole reason for the clock to stop is an injury. Calhoun said the intent is to prevent players from faking injuries to stop the clock.

• Establishing 3 seconds as the minimum amount of time required to be on the game clock in order to spike the ball to stop the clock.

• Allowing the use of electronic communication by the on-field officiating crew. Such devises were used successfully in an experiment in the Southeastern Conference. The equipment would not be required.

• Allowing the Big 12 to experiment with using an eighth official on the field in conference games. This official would be placed in the backfield opposite the referee and, according to Calhoun, would add another set of eyes to detect holding on the offensive line.