<P> ACB's (also abbreviated as PHIBCB) evolved out of pontoon assembly battalions formed as part of the Seabees during World War II . After the war, these battalions (originally MCBs 104 and 105) were renamed ACB's and assigned to Naval Beach Groups . </P> <P> Today, while the ACBs are part of the NCF, they do not report to 1 NCD, instead reporting to surface TYCOMs . Additionally, the ACBs have a different personnel mix than an NMCB with half the enlisted personnel being traditional Seabee rates and the other half being fleet rates . </P> <Ul> <Li> Construction Battalion Unit (CBU) </Li> <Li> Construction Detachments (CBD) </Li> <Li> Naval Construction Force Support Unit (NCFSU) </Li> <Li> Pontoon Assembly Detachments (PAD) </Li> <Li> Seabee Readiness Groups </Li> </Ul> <Li> Construction Battalion Unit (CBU) </Li>

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