John, what You say about this?
it’s fragment of Technical Memorandum No. WS.1065
APPENDIX 2 ARMAMENT BEING FITTED TO AIR FORCE HELICOPTERS
1 Whirlwind Mk.10
(a) Four Nord SS-11 missiles,
(b) One 20 mm Hispano cannon mounted either as a fixed or free gun.
NOTE: The cannon may bo replaced by either two 7.62 mm machine guns or four 2 inch, 7-tube rocket launchers.
And this:
FLIGHT International, 1 November 1962 “Whirlwind Squadron’s Role
Army Close Support” By Humphrey Wynn. “… operational activities, such as airlifting supplies for the Army: casualty evacuation; missile- and gun-firing; minelaying; training parachute troops; assisting flood victims; spraying mosquito-ridden ground; and carrying VIPs…”
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