The Party slogan that specifically references the proles is "Proles and animals are free." The slogan cited above is aimed more at Party members than at the proles. Indeed, there is very little effort expended to maintain the loyalty of the proles. The Party prefers to keep them distracted through such means as the lottery, cheap trashy literature, and the pubs. As Orwell says in Chapter 7:
To keep them in control was not difficult. A few agents of the Thought Police moved always among them, spreading false rumours and marking down and eliminating the few individuals who were judged capable of becoming dangerous; but no attempt was made to indoctrinate them with the ideology of the Party.
Patriotism, as it exists in 1984, is not as relevant to the proles as it is to Party members. Proles are more or less left alone to live their lives in dreary poverty in the squalid streets of London.
The slogans are designed to keep control of the proles. They are:
WAR IS PEACE
FREEDOM IS SLAVERY
IGNORANCE IS STRENGTH
These lovely contradictory phrases are designed to keep the proles simple-minded and accepting. If the proles are kept patriotic, they won't question, and if they don't question they will be easy to control.