as is the flag to be carried

[8769]

The following is a passage describing a picture of a drum major.

All drum major uniforms are similar. They all include high boots, white gloves and a tall hat. The letters on the front of the uniform are always different, of course, as is the flag to be carried.
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I don’t understand what “as is the flag to be carried” means. Is it a clause inverted from the original order: “as the flag to be carried is”?

 

[marget]

The following is a passage describing a picture of a drum major.

All drum major uniforms are similar. They all include high boots, white gloves and a tall hat. The letters on the front of the uniform are always different, of course, as is the flag to be carried.
​

I don’t understand what “as is the flag to be carried” means. Is it a clause inverted from the original order: “as the flag to be carried is”?

Yes, it's simply an inversion.

 

[GreenWhiteBlue]

The problem here is the mixing of singular and plural. If "letters" is correctly plural, then it should be "flags". If "flag" is correctly singular, then it should have been "letter".