[7] In the absence through injury of Stephen Carr and Jonathan Spector, Packwood made his first-team debut on August 14, 2012, starting at right-back in the first round League Cup match against Barnet.

[9] During the second half of an FA Cup tie at Leeds United on January 5, 2013, Packwood was carried from the field having sustained multiple fractures to his tibia and fibula after landing awkwardly from an apparently innocuous aerial challenge.

[12] He played a few more times for the development squad, and on October 17 joined League Two (fourth-tier) Bristol Rovers on loan for a month, to improve his match fitness.

[14] After four matches – he missed Rovers' FA Cup win because Birmingham did not want him cup-tied – the loan was extended until January 11, 2014, on condition that he could be recalled at 24 hours' notice.

[15] He played four more matches before Birmingham lost left-back Mitch Hancox to injury, and with fellow defenders Paul Robinson and Dan Burn nearing possible suspensions, Packwood was recalled on December 11.

[21] He went straight into the starting eleven for the visit to Milton Keynes Dons, and was sent off for bringing down Benik Afobe to concede a penalty, which was converted for the fifth goal of a 6–0 defeat.

[22] With several defenders ahead of him in the pecking order, Packwood joined League Two club Cheltenham Town on March 11 on loan until the end of the season.

[36] Packwood received his first call up to the senior squad for a March 5, 2014, friendly against Ukraine,[37] but he and Birmingham teammate Jonathan Spector remained unused substitutes as the United States lost 2–0.