diff --git a/java/src/org/broadinstitute/sting/gatk/GenomeAnalysisTK.java b/java/src/org/broadinstitute/sting/gatk/GenomeAnalysisTK.java
index 155f0b2ba..e0d91d363 100644
--- a/java/src/org/broadinstitute/sting/gatk/GenomeAnalysisTK.java
+++ b/java/src/org/broadinstitute/sting/gatk/GenomeAnalysisTK.java
@@ -41,6 +41,7 @@ public class GenomeAnalysisTK extends CommandLineProgram {
     public String Analysis_Name = null;
     public String DBSNP_FILE = null;
     public String HAPMAP_FILE = null;
+    public String HAPMAP_CHIP_FILE = null;
     public Boolean ENABLED_THREADED_IO = false;
     public Boolean UNSAFE = false;
     public String MAX_ON_FLY_SORTS = null;
@@ -104,6 +105,7 @@ public class GenomeAnalysisTK extends CommandLineProgram {
         m_parser.addRequiredArg("analysis_type", "T", "Type of analysis to run", "Analysis_Name");
         m_parser.addOptionalArg("DBSNP", "D", "DBSNP file", "DBSNP_FILE");
         m_parser.addOptionalArg("hapmap", "H", "Hapmap file", "HAPMAP_FILE");
+        m_parser.addOptionalArg("hapmap_chip", "hc", "Hapmap chip file", "HAPMAP_CHIP_FILE");
         m_parser.addOptionalFlag("threaded_IO", "P", "If set, enables threaded I/O operations", "ENABLED_THREADED_IO");
         m_parser.addOptionalFlag("unsafe", "U", "If set, enables unsafe operations, nothing will be checked at runtime.", "UNSAFE");
         m_parser.addOptionalArg("sort_on_the_fly", "sort", "Maximum number of reads to sort on the fly", "MAX_ON_FLY_SORTS");
@@ -176,6 +178,10 @@ public class GenomeAnalysisTK extends CommandLineProgram {
                 //dbsnp.testMe();
                 rods.add(hapmap); // { gff, dbsnp };
             }
+            if ( HAPMAP_CHIP_FILE != null ) {
+                ReferenceOrderedData<rodGFF> hapmapChip = new ReferenceOrderedData<rodGFF>(new File(HAPMAP_CHIP_FILE), rodGFF.class );
+                rods.add(hapmapChip);
+            }
         }
 
         initializeOutputStreams();
diff --git a/java/src/org/broadinstitute/sting/playground/gatk/walkers/AlleleFrequencyWalker.java b/java/src/org/broadinstitute/sting/playground/gatk/walkers/AlleleFrequencyWalker.java
index 8a9a447bc..0821a5d40 100755
--- a/java/src/org/broadinstitute/sting/playground/gatk/walkers/AlleleFrequencyWalker.java
+++ b/java/src/org/broadinstitute/sting/playground/gatk/walkers/AlleleFrequencyWalker.java
@@ -18,11 +18,12 @@ import java.io.PrintStream;
 
 public class AlleleFrequencyWalker extends LocusWalker<AlleleFrequencyEstimate, String>// implements AllelicVariant
 {
-    @Argument public int    N;
+    @Argument(doc="Number of chromosomes in data") public int    N;
     @Argument(required=false,defaultValue="0") public int DOWNSAMPLE;
-    @Argument public String GFF_OUTPUT_FILE;
+    @Argument(doc="File to output GFF formatted allele frequency calls") public String GFF_OUTPUT_FILE;
     @Argument(shortName="met", doc="Turns on logging of metrics on the fly with AlleleFrequency calculation") public boolean LOG_METRICS;
-    @Argument(required=false, defaultValue="", doc="Name of file where metrics will output") public String METRICS_OUTPUT_FILE;
+    @Argument(required=false, defaultValue="metrics.out", doc="Name of file where metrics will output") public String METRICS_OUTPUT_FILE;
+    @Argument(required=false, doc="Ignores 4-base probabilities and only uses the quality of the best/called base") public static boolean FORCE_1BASE_PROBS;
 
     protected static Logger logger = Logger.getLogger(AlleleFrequencyWalker.class);
 
@@ -118,7 +119,7 @@ public class AlleleFrequencyWalker extends LocusWalker<AlleleFrequencyEstimate,
         return alleleFreq;
     }
 
-    static public String getBases (LocusContext context) 
+    static public String getBases (LocusContext context)
     {
         // Convert bases to CharArray
         int numReads = context.getReads().size(); //numReads();
@@ -135,7 +136,7 @@ public class AlleleFrequencyWalker extends LocusWalker<AlleleFrequencyEstimate,
         return new String(bases);
     }
 
-    static public double[][] getQuals (LocusContext context) 
+    static public double[][] getQuals (LocusContext context)
     {
         int numReads = context.getReads().size(); //numReads();
         double[][] quals = new double[numReads][4];
@@ -153,7 +154,7 @@ public class AlleleFrequencyWalker extends LocusWalker<AlleleFrequencyEstimate,
             // For other 3 bases, check if 2-base probs exist
             assert (reads.size() > 0);
             Object SQ_field = reads.get(0).getAttribute("SQ");
-            if (SQ_field == null) {
+            if (SQ_field == null || FORCE_1BASE_PROBS) {
                 // Set all nonref qual scores to their share of the remaining probality not "used" by the reference base's qual
                 double nonref_quals = (1.0 - quals[i][callednum]) / 3;
                 for (int b=0; b<4; b++)
@@ -398,7 +399,7 @@ public class AlleleFrequencyWalker extends LocusWalker<AlleleFrequencyEstimate,
         confident_ref_interval_length  = 0;
         last_position_considered       = -1;
         inside_confident_ref_interval  = false;
-        if (LOG_METRICS) metrics = new AlleleMetrics("SNTH");//METRICS_OUTPUT_FILE);
+        if (LOG_METRICS) metrics = new AlleleMetrics(METRICS_OUTPUT_FILE);
         return "";
     }
 
@@ -508,6 +509,7 @@ public class AlleleFrequencyWalker extends LocusWalker<AlleleFrequencyEstimate,
             inside_confident_ref_interval = false;
         }
 
+        if (LOG_METRICS) metrics.printMetrics();
 
         try
         {
@@ -522,7 +524,6 @@ public class AlleleFrequencyWalker extends LocusWalker<AlleleFrequencyEstimate,
             System.exit(-1);
         }
 
-        if (LOG_METRICS) metrics.printMetrics();
     }
 
     static void print_base_qual_matrix(double [][]quals) {
diff --git a/java/src/org/broadinstitute/sting/playground/utils/AlleleMetrics.java b/java/src/org/broadinstitute/sting/playground/utils/AlleleMetrics.java
index 66751c280..31d33af32 100755
--- a/java/src/org/broadinstitute/sting/playground/utils/AlleleMetrics.java
+++ b/java/src/org/broadinstitute/sting/playground/utils/AlleleMetrics.java
@@ -102,9 +102,9 @@ public class AlleleMetrics {
             }
 
             // Hapmap debug info
-            out.format("HAPMAP %.2f %.2f %.2f ", hapmap_q, alleleFreq.qstar, alleleFreq.lodVsRef);
-            String called_genotype = alleleFreq.asString();
-            out.format("%s %s %c %c", hapmap_genotype, called_genotype, alleleFreq.ref, alleleFreq.alt);
+            //out.format("HAPMAP DEBUG %.2f %.2f %.2f ", hapmap_q, alleleFreq.qstar, alleleFreq.lodVsRef);
+            //String called_genotype = alleleFreq.asString();
+            //out.format("%s %s %c %c", hapmap_genotype, called_genotype, alleleFreq.ref, alleleFreq.alt);
 
             if (alleleFreq.lodVsNextBest >= LOD_cutoff) {
 
@@ -114,7 +114,7 @@ public class AlleleMetrics {
                 }else{
                     hapmap_genotype_incorrect++;
                     //System.out.printf(" INCORRECT GENOTYPE    Bases: %s", AlleleFrequencyWalker.getBases(context));
-                    System.out.printf(" INCORRECT GENOTYPE");
+                    //out.printf(" INCORRECT GENOTYPE");
                     //AlleleFrequencyWalker.print_base_qual_matrix(AlleleFrequencyWalker.getOneBaseQuals(context));
                 }
             }
@@ -127,13 +127,13 @@ public class AlleleMetrics {
                 boolean called_var = alleleFreq.qstar != 0.0;
                 if (hapmap_q != -1 && hapmap_var != called_var) {
                     hapmap_refvar_incorrect++;
-                    System.out.printf(" INCORRECT REFVAR CALL");
+                    //out.printf(" INCORRECT REFVAR CALL");
                 }else{
                     hapmap_refvar_correct++;
                 }
             }
 
-            out.print("\n");
+            //out.print("\n");
         }
     }