Why not? Countdowns are done in T minus. (Time minus)
If pain comes in (minus)23 we are counting down to the pain.
oh bam sec
There is a LOT here
http://www.riflewarrior.com/okc.html
1995 Developments
About three weeks after the bombing I received a telephone call at the Tulsa Police Department from a man who stated that he would not give me his name, but that he worked for a federal investigative agency and was based in Little Rock. He said that the key to the bombing was the records that had been taken out of the building on Day One by the mysterious team who removed them from the basement. He said that they were the investigative records from his agency (who he would not identify) during the Iran/Contra affair on the drug connections revolving around Rich Mountain Aviation at the Mena Airport, and of the involvement of the Clintons and others in the affair, which included the lack of investigation from the Arkansas law enforcement agencies. He stated that the investigatory records were removed from Little Rock and moved to Oklahoma City (Murrah Building) for safe keeping while Clinton was president (Obviously there was fear they would disappear or be destroyed).
In my estimation, after extensively researching the Iran/Contra affair, it would appear the source worked for either the DEA or IRS. Both of these agencies did investigations of the Mena affair and its political connections. There was no call back number and the man never contacted me again. However, the fact that the rescue attempts were halted early in the day so that boxes of records could be removed adds weight to the claims made by the source.
A few months later I had occasion to interview a Tulsa Fire Department member who responded to the bombing on two occasions. The second he told me that he had witnessed, on Day Ten, a white Ryder type truck backed up to the post office one block from the Murrah Building, which had been damaged and shut down, and that fifty or so "SWAT guys" dressed in black with black hoods over their faces, carrying submachine guns, guarded the shipping dock while boxes were moved from the Post Office and loaded on the truck. When he asked his FBI escort what was happening, he was told they were "picking up undelivered mail."