Millington stepped up to become Town boss soon after the 2021-22 season ended, replacing Pete Wild when he left to join Barrow.
After a tough start in his first season, The Shaymen eventually managed an 11th placed finish and went on to win the FA Trophy for the second time in their history by beating gateshead 1-0 at Wembley.
Millington then guided Halifax to a play-off finish in his second season before losing 4-2 to Solihull Moors.
Another top seven finish was secured this season, but Town crashed out at the first hurdle again, losing 4-0 at Oldham Athletic.
We take a look back at his first team selection as Shaymen boss, in a 2-0 defeat at Barnet on August 6, 2022 and see where those players are now.
5. Tom Clarke
Experienced a tough time at Halifax, never properly settling due to form and injury problems. Retired from the game in September 2023 due to a knee injury aged 35 and joined Preston's youth set-up as a coach. Photo: MARCUS BRANSTON
6. Sam Smart
Another player whose move at Halifax never really took off. Has gone on to play for Brackley, Boston, Farnborough and Matlock since leaving The Shay after just six league appearances. Photo: MARCUS BRANSTON
7. Jamie Cooke
Also made his debut in the defeat at Barnet before going on to score the winner at Wembley at the end of that season. Will remain at the club next season after Town triggered the option in his contract. Photo: Chris Nutton/FC Halifax Town
8. Jordan Keane
Had an injury hit spell with Town, playing 22 times in the league in his first season and making 26 league appearances in the 2023-24 campaign before moving to National League North side Southport last summer, where he was captain for the season just gone. Photo: Marcus Branston