Junior wide receiver Michael Pittman runs down the field during spring practice. (Josh Dunst/Daily Trojan) There are a handful of players who seem to have made strides from where they were last year and look poised to step up for the Trojans. Freshman defensive back Britton Allen has shown promise, offering impressive tenacity in the secondary with a penchant for stripping out the ball. Sophomore Devon Williams has been putting together his unique combination of top-end speed and incredible length at 6-foot-4 to become a dangerous receiving weapon. Besides tangible changes to the team’s offensive strategy, there’s been a concerted effort to change elements of the team philosophy as a whole with toughness and discipline at its core. The team as realized it needs to work on accountability after a 2018 season that saw them average almost 14 penalties per game, and the coaching staff is determined not to let that happen again. Former offensive coordinator Tee Martin has been replaced by former University of North Texas head coach Graham Harrell. Harrell brings with him the dynamic air-raid offense; a system that’s spread quickly across the college football landscape in recent years, yet has never appearing at USC until now. The Trojans have long maintained a traditional pro-style offense, built on deep drops from under center, long developing routes and multi-level reads. The air-raid, on the other hand, emphasizes stretching the field both horizontally and vertically, generally putting the quarterback in a shotgun alignment and allowing him to make quick and often simple reads. There are now live referees throwing flags on any penalties at every practice. It’s already seemed to have paid rapid dividends, as there’s been a noticeable drop in violations since the first day of practice. Whether or not it carries over to real games will remain to be seen, but it’s a promising start. Two weeks into Spring Football, it’s already clear that the Trojans will be doing things very differently this year. Looking to bounce back from their worst season in 19 years, head coach Clay Helton and his staff have are shaking things up across the board. The system encourages simplicity from players across the formation, allowing them to focus more directly on executing individual tasks without needing to process the entirety of the play. Multiple players have mentioned that the simplicity of the air raid allows them to “play fast,” relieving them of the weight of processing too many moving parts during each play. That difference has shown on the field, with the offense running a surprisingly high number of offensive plays in practice for this early in the offseason. Although a two-week sample size isn’t much to work with, a number of players already seem to be ready to serve as key contributors for the upcoming season. Some are unsurprising — veteran receivers Tyler Vaughns and Michael Pittman, linebacker John Houston and defensive tackle Jay Tufele have all shown up to work, picking up from where they left off. The shift to the air raid has been evident in almost every aspect of practice so far. There’s been an emphasis on letting the offense just run, even this early into training without the absorption of an entire pro-style playbook. Redshirt junior receiver Tyler Vaughns, now one of the team’s upperclassmen, commented on the benefits of that fact. Some of last year’s impact freshman also seem to be in their stride — linebacker Palaie Gaoteote has remained a standout and receiver Amon-Ra St. Brown has been as consistent as ever. Talanoa Hufanga had been looking even better at safety than he did last year, though an injury in Saturday’s practice makes his future status unclear. Hufanga had a fantastic freshman season until a collarbone injury took him out for the year. The same injury that seems to have been re-aggravated despite his non-contact designation in practice. “We’re getting more live reps which I like,” Vaughns said. “We’re getting more team reps and everything like that, so it’s really helping us as an offense.” Two sophomores who played a very limited role last year have stepped up in these two weeks. Running back Markese Stepp, buried on the depth chart for most of last year, has been a force on the practice field. Stepp is a runaway freight train at 235 pounds, bulldozing defenders with regularity. With the sidelining of Stephen Carr and Vavae Malepeai to the flu, Stepp has received many first team reps and shown showing ability to catch the ball out of the backfield along with being a punishing runner. On the other side of the ball, sophomore cornerback Isaac Taylor-Stuart missed most of last season due to injury after playing mostly special teams early in the year, never receiving an opportunity to play real game snaps on defense. Taylor-Stuart is tremendously gifted as an athlete, with blazing speed to go with his impressive frame of 6-foot-2, 205 pounds, but his lack of refined technique held him back in the early stages of his freshman year. However, he’s become one of the first-string corners and his continued improvement could be one of the most important factors in the success of the Trojan defense come fall.