This is the from the errata sheet in my Citadel game and it's dated 15 July
1977. Don't know what the difference (if any) is between this and the
February errata, but here it is:

CLARIFICATIONS AND ERRATA: Citadel 15 July 1977

COUNTERS Two extra C-119 counters are provided in the counter mix. These
are spares and not called for in any of the scenarios. One T'ai light
company is not backprinted. This is not an error; when the unit is
inverted, it is eliminated.

RULES

Rule 8 - Movement/Opportunity Fire: It is convievable that a unit will be
forced to pause before it reaches a vulnerability point or before it ends
its movement. For instance, two stacks of French units are moving along a
road. The first stack pauses as it enters a swamp hex. The second stack
cannot continue to move, since this would cause it to pause in the same hex
as the other stack and thus be overstacked. The unit must, therefore, pause
for opportunity fire even though the hex it occupies does not constitute a
vulnerability point. When the stck resumes movement along the road, it must
also pause in the swamp hex, as this still constitutes a normal
vulnerability point.

Rule 10 - Spotting: The numbered paragraphs should read: 1. It is in any
hex other than a full or partial jungle hex or a trench/tunnel/pit (if
Vietminh). 2. It is in a full or partial jungle hex or a
trench/tunnel/weapons pit and a unit friendly to the firing unit is
adjacent to it. 3. It is a recoiless rifle unit in any hex which has fired
in a previous phase and has not moved since.

Rule 13 - Terrain: Full Jungle Hexes: Two different terrain modifiers are
listed for full jungle hexes - one for Vietminh weapons units and one for
all other units. This is because Vietminh weapons units were extremely well
dug in. If the French player wishes to fire at a full jungle hex containing
both infantry and weapons class units, he may do so one of two ways. He may
fire using the column modifiers for weapons units, in which case losses are
subtracted normally, or he may fire using the normal column modifiers, in
which case losses are subtracted only from infantry class units.

Rule 15 - A. Vietminh Replacement Availability: The first sentence of this
section is incorrect and should read, "Beginning with the April1 turn, the
Vietminh player receives six strength points of replacements per turn." Add
the following paragraph to section A: At the conclusion of each player
turn, the Vietminh player may remove all loss markers from antiaircraft
units still on the board. This does not count against normal Vietminh
replacement availability. Antiaircraft units which have been eliminated may
be returned to play by the normal replacement procedute. C. Absorbing
Replacements: The last sentence of this section is incorrect and should
read, "Heavy weapons units and combat infantry class companies which have
been eliminated may be rebuilt by replacements. Combat infantry class
battalions may not. Rebuilt combat infantry class companies may still not
be reinforced above their critical loss level.

Rule 18 - Vietminh Entrenchments: The Vietminh are limited only by the
rules in the number of trench hexes they may construct, not by the counter
mix. Additional trench markers may be made from blank counters as desired.

Rule 19 - Tanks: Section B, Melee Combat: is incorrect. Each tank adds one
(not three) to the averaged morale and only operational tanks may add their
strength points to a melee attack. Disabled tanks may add their strength
points to a melee defense. Only operational tanks may retreat as a result
of combat; disabled tanks forced to retreat are destroyed instead.

Rule 26 - Missions: A. Tactical Air: Tactical air missions may not be flown
against solitary Vietminh combat infantry class units in a full jungle or
trench hex unless adjacent to a French ground unit in the French player
turn, or stacked with a Vietminh heavy weapons class unit in either player
turn. C. Spotting: Spotting is always flown at medium altitude.