These vehicles arrived there Wednesday after leaving its Manila-holding area, Army spokesperson Lt. Col. Noel Detoyato said in a message to the PNA.
The six AFVs arrived in the Philippines late this June.
"Six APCs are already at MID headquarters in Tarlac. Other attachments and armaments will be installed in within 15 days," he added.
The six APCs will be followed by 18 other units, four of them by July or August.
Fourteen of the M-113s were configured as fire support vehicles, four as infantry fighting vehicles, six as armored personnel carriers, another four as armored recovery units.
The M-113s were supplied by Israeli defense manufacturer Elbit Systems Ltd.
The contract, which is worth Php882 million, was signed last June 22, 2014.
Upgrades include installation of 25 mm unmanned turrets, 12.7 mm remote controlled weapon stations (RCWS) and fire control systems (FCS) for 90 mm turrets.
The PA operates around 343 AFVs (armored fighting vehicles) and APCs.
Around 85 percent of these AFVs are on green status (fully mission capable) while another 10 percent are on yellow status (undergoing repair) and five percent are on red (beyond repair)
150 of these AFVs are of United Kingdom-built GKN "Simba" while the remainder consists of US designed V-150 and V-200 APCs, M-113s, Turkish made ACV-300s and British Scorpion CVRTs.
These vehicles give the PA its armor capability and are organized into a 14-vehicle mechanized infantry companion for deployment with regular units.
An M-113 Armored Personnel Carrier with Elbit Systems' ORCWS 25-30mm Unmanned Turret System.