Help me identify these military ICs
These are military grade radiation proof 54 series TTL chips.


Top and middle LA8A are quad 2-input NAND gates with open collector (5400)
Bottom LB1A is quad 2-input NAND gates (5401)


Pinout is unknown. I think you can figure it out yourself.

PCBs should not be old as datecodes of the chips are 2011.