<s>
A	O
shackle	B-Algorithm
code	I-Algorithm
is	O
a	O
cryptographic	B-General_Concept
system	I-General_Concept
used	O
in	O
radio	O
communications	O
on	O
the	O
battle	O
field	O
by	O
the	O
US	O
military	O
and	O
the	O
Rhodesian	O
Army	O
.	O
</s>
<s>
During	O
World	O
War	O
II	O
,	O
the	O
shackle	B-Algorithm
codes	I-Algorithm
took	O
time	O
to	O
encode	O
and	O
decode	O
,	O
so	O
during	O
battle	O
,	O
sometimes	O
troops	O
radioed	O
English	O
plaintext	O
with	O
profanity	O
.	O
</s>
