Help MP on some odd items in MP grouping

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I picked up a Military Police grouping that belong to a vet who served with the 97th MP Bn / 18th MP Bd in Vietnam 1967 -68. Included and pictured was a MP Green colored clip on tie. I've never seen a photo of a MP with a green tie. I know civilian police wear clip on ties so I didn't think that was stretch for MP use, but the green color has me questioning this common. Has anyone come across this before ? Also, this group with a Navy Boatswain's whistle also pictured. What would this type whistle be used for by a ground force MP? Has anyone come across this before? I hope you can help.

Thanks,

Chris

[MP25]

The neck tie for the Class A Army uniform in the 1960s was black.

That whistle was never used by Army MPs.....The issued pea whistle

was o/d plastic. Almost all MPs purchased brass whistles, although

they were nothing more than decoration...….

[redone]

The neck tie for the Class A Army uniform in the 1960s was black.

That whistle was never used by Army MPs.....The issued pea whistle

was o/d plastic. Almost all MPs purchased brass whistles, although

they were nothing more than decoration...….

That's what I thought.

Thank you,

Chris