ID Arm badges.

[zephyr4]

My son brought me these two arm badges from the car boot sale,can any one id the badge,picture is of front and rear.
I am not sure if they have any age or not.

Thanks z4

[zwerge]

HI, it is US navy,Petty Officer first class,I don`t recognize the symbol on it,must be post WW2,looks like an ordnance symbol.

[zephyr4]

zwerge, thanks for pointing me in the right direction.

I have found this info.
Nuclear Weaponsman petty officer First Class. This USN specialty was in use for only a short period from 1957-1961.