Is SES the keystone?

"On May 18, 1990, the Assistant Commissioner for Quality and Contract Administration, General Services Administration, confirmed that the Federal Supply Service views the SES flag as an item of personal decoration in an executive's office, similar to the U.S. flag or an agency flag. To quote the letter, "the SES flag is eligible for agency issuance and remains in the office as property belonging to the U.S. government."

What the SES Insignia Represents: The SES insignia or emblem at the center of the design represents a (((keystone))) (emphasis is Anon's) e – the center stone that holds all the stones of an arch in place. This represents the critical role of the SES as a central coordinating point between Government's political leadership which sets the political agenda and the line workers who implement it. Members of the SES translate that political agenda into reality. The upright lines in the center of the keystone represent a column in which individual SES members are united into a single leadership corps. There is no particular symbolism to the number of lines, which has varied over the years with different iterations of the logo. The SES insignia can not be modified and may only be used for official Government business."

Source: The Office of Personnel Management https:// seniorexecs.org/2-uncategorised/452-the-official-senior-executive-service-flag

Forgive me if this has already been posted - SES was mentioned here yesterday, but I did a brief search and couldn't find it.