The Watchtower Society teaches that all Jehovah's Witnesses should use "Theocratic Warfare Strategy":

Riches Book (Published in 1936), Page 177:

"A lie is a false statement made by one to another one who is entitled to hear and to know the truth"
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The Watchtower, May 1, 1957 Issue, Page 285:

Use Theocratic War Strategy

A WITNESS of Jehovah was going from house to house in Eastern Germany when she met a violent opposer. Knowing at once what to expect she changed her red blouse for a green one in the very next hallway. No sooner had she appeared on the street than a Communist officer asked her if she had seen a woman with a red blouse. No, she replied, and went on her way. Did she tell a lie? No, she did not. She was not a liar. Rather, she was using theocratic war strategy, hiding the truth by action and word for the sake of the ministry. In this she had good Scriptural precedent. Did not Rahab hide the Israelite spies by both action and word? Did not Abraham, Isaac, David and others likewise hide the truth at times when faced with a hostile enemy? They certainly did, and never do we read a word of censure for their doing so. Rather, we read of their being termed exemplary servants of Jehovah. Their actions were in line with Jesus' wise counsel: "Look! I am sending you forth as sheep amidst wolves; therefore prove yourselves cautious as serpents and yet innocent as doves."--Matt. 10:16

[...] At times [a Jehovah's Witness who takes the witness stand in court] may prefer to refuse to speak and suffer the consequences rather than betray his brothers or the interests of God's work.

[...] hiding the truth, which he is not entitled to know, from an enemy does not harm him

[...] So in time of spiritual warfare it is proper to misdirect the enemy by hiding the truth. It is done unselfishly; it does not harm anyone; on the contrary, it does much good.

[...] Today God's servants are engaged in a warfare, a spiritual, theocratic warfare, a warfare ordered by God against wicked spirit forces and against false teachings. God's servants are sent forth as sheep among wolves and therefore need to exercise the extreme caution of serpents so as to protect properly the interests of God's kingdo m c ommitted to them. At all times they must be very careful not to divulge any information to the enemy that he could use to hamper the preaching work.
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The Watchtower, October 1, 1951 Issue, Pages 596-598:

When evil men are seeking to do injury to a Christian or some of his brothers or to God's organization and they come trying to pry into private affairs, is it necessary for a Christian to answer such evil men?

[...] If you know an evil man is trying to inflict harm on a brother and he asks you where the brother may be found, it is not necessary to answer.

[...] There are instances, such as existed in the Nazi German regime, where it was a crime to be one of Jehovah's witnesses. If someone came and asked an individual to commit himself as to whether he was one of Jehovah's witnesses or not and he replied that he was, he could be immediately arrested and put into prison. In such an instance the individual would have to decide for himself what he wanted to do. He might conclude that it is proper merely to say, "I am a Christian," or else say nothing at all. This would not be a denial of Christ such as is mentioned at Matthew 10:33.

[...] under some circumstances one may choose to remain silent and face contempt charges.

[...] No harm is practiced, however, by withholding incriminating information from one who is not entitled to know. An example of this in English-speaking countries is, when one is under arrest, he can, if he chooses, legally refrain from giving information to a police officer who may ask incriminating questions . No answer need be given him, as it is none of the officer's business. It is a matter for court. But when one goes into a court and enters within the witness box and swears to tell the truth, matters concerning the transaction theretofore confidential and possibly incriminating no longer can be withheld without risking contempt charges, as the judge has the authority to demand an answer.

[...] Various characters of the Bible have been accused of lying, such as Jacob, Rahab, the Gibeonites, David and others, but there is no record in the Bible that they came under divine disapproval for this.
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The Watchtower, June 1, 1960 Issue, Pages 351-352:

"We must tell the truth to one who is entitled to know, but if one is not so entitled we may be evasive.

[...] As a soldier of Christ he is in theocratic warfare and he must exercise added caution when dealing with God's foes. Thus the Scriptures show that for the purpose of protecting the interests of God's cause, it is proper to hide the truth from God's enemies."
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Aid to Bible Understanding Book (Published in 1971), Pages 1060-1061:

Lying generally involves saying something false to a person who is entitled to know the truth

[...] While malicious lying is definitely condemned in the Bible, this does not mean that a person is under obligation to divulge truthful information to people who are not entitled to it.
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Insight on the Scriptures, Volume 2 (Published in 1988), Pages 244-245:

Lying generally involves saying something false to a person who is entitled to know the truth

[...] While malicious lying is definitely condemned in the Bible, this does not mean that a person is under obligation to divulge truthful information to people who are not entitled to it. Jesus Christ counseled: "Do not give what is holy to dogs, neither throw your pearls before swine, that they may never trample them under their feet and turn around and rip you open." (Mt 7:6) That is why Jesus on certain occasions refrained from giving full information or direct answers to certain questions when doing so could have brought unnecessary harm. (Mt 15:1-6; 21:23 -27; Joh 7:3-10) Evidently the course of Abraham, Isaac, Rahab, and Elisha in misdirecting or in withholding full facts from nonworshipers of Jehovah must be viewed in the same light.
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The Watchtower, August 15, 2001 Issue:

Sarai could say that she was Abram's sister because she really was his half sister. (Genesis 20:12) Furthermore, he was not under obligation to divulge information to people who were not entitled to it. ( Matthew 7:6) Faithful servants of God in modern times heed the Bible's command to be honest. (Hebrews 13:18) They would never, for instance, lie under oath in a court of law. When the physical or spiritual lives of their brothers are at stake, such as in times of persecution or civil distress, however, they heed Jesus' counsel to be "cautious as serpents and yet innocent as doves."-- Matthew 10:16; see The Watchtower, November 1, 1996 , page 18, paragraph 19.
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Awake!, February 8, 2000 Issue, Page 21:

Of course, being truthful does not mean that we are obligated to divulge all information to anyone who asks it of us. Do not give what is holy to dogs, neither throw your pearls before swine, that they may never ... turn around and rip you open, warned Jesus, at Matthew 7:6. For example, individuals with wicked intent may have no right to know certain things. Christians understand that they are living in a hostile world. Thus, Jesus advised his disciples to be cautious as serpents while remaining innocent as doves. ( Matthew 10:16; John 15:19) Jesus did not always disclose the full truth, especially when revealing all the facts could have brought unnecessary harm to himself or his disciples. Still, even at such times, he did not lie. Instead, he chose either to say nothing or to divert the conversation in another direction.
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The Watchtower, January 15, 1983 Issue, Page 22:

This fact cannot be overemphasized: We are in a war with superhuman foes, and we constantly need to be aware of this.
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A Reporter's Comment from the Australian "Sunday" Program  Television Show called "Silent Witnesses", which aired on Television on September 22nd, 2002 :

"Officially, the [Jehovah's Witness] church denies all knowledge of the concept of theocratic warfare"
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End of Theocratic Warfare Strategy Quotes