The pliers are adjustable curved pliers for A-N fittings. Used to tighten/loosen them. There are hard plastic or nylon inserts for the slots that are replaceable...still available.
Don't know if military still uses A-N fittings, but the fittings were developed by US military around time of entry into WW ll, for all the services so fittings would be universal for all services, so same tools could be used on an aircraft , a ship, or a tank.
Still high quality stuff for auto use.
Reason for the inserts...fittings were/are usually made from aluminum and regular tools would damage them...nylon would grab but not damage them.