In the AFFS,
1 BA squad = 4 troopers
1 platoon = 4 squads (16)
1 company = 4 platoons (64)
1 battalion = 4 companies (256)
1 regiment = 3-4 battalions (768 to 1,024)
LCTs are "intended" to have 1 regiment of battle armour, "though few today are that large" (as of 3079). So there you go.